INTRODUCTION

 

JBS Haldane, in his prophetic essay "Daedalus, or Science and Future" (1924) is the first man who foresees Future societies in which biologists would invent a new kind of algae in order to solve hunger in the world; and also in those societies "ectogenesy" would be a common practice. He imagines "ecto-genetic" children grown up and fed in artificial wombs (incubators) and modified by eu-genetic selection. In 1924 nobody knew anything about the biochemistry of genes. He also raises the question that any "biological invention" would be rejected as a "perversion", but they would be accepted gradually (progressively) and it would also be shocking the old ways of behaving and difficult to believe that those ways of behaving were clearly upheld.

Haldane arose a question that appeared in a Brave New World by Aldous Huxley later (1932).

In Brave New World human beings are born and developed putting embryos into mechanical wombs. Giving more oxygen to some embryos and hurting others deliberately they can obtain people with different levels of intelligence. They follow clonation to produce more people.

After being born every breed (race) suffers a brainwashing to accept their own fate (destiny) and value themselves more than other races. When they become adults, with the use of drugs they get under control. "Soma" of the drug of euphoria guarantees happiness to everybody. This way they obtain "alpha", "beta", "gamma", "epsilon".

Nearly 70 years after the edition of Brave New World we have progressed a great deal (if we can call that progress). Nowadays it is still not possible to grow up embryos in artificial wombs, but test tube fertilisation in a mother's womb or in a hired mother's womb has become a quite common practice (deed). Scientists believe that human beings will be created in laboratories in twenty years.

Genetic revolution has been one of the most spectacular revolutions during the 20th century, and it will be highly developed during 2001. On June 26th, private and state firms make public (disclose) that the first draft about human "genome" has been finished. What do scientists really know up to now? Finishing the 1st draft about human "genome" has led us towards "post-genomic" period.

Discovering more about human "genome" it's only the beginning. The most difficult has yet to come: we have to find out genes within "genome", decode "proteoma" and be able to know which function every gene has.

 

 

Genetic engineering, altogether with decoding the "human genome" have led us towards a new period. Where can the limits be set up? (Which are the limits?).

 

That nightmare, as many people say about Aldous Huxley Brave New World, is already here, future is here. News like the clonation of Dolly the sheep, techniques of genetic engineering applied to manipulation of food, "crazy" cows, xeno-transplanting? Shock us every day. Reality overcomes fiction.

The subject Scientific news and science fiction aims to involve pupils in the main scientific developments, those which have a real incidence in our world, those which shock us, worry us or give us hope.

We think it is really important for pupils to be informed, to discuss and have an opinion about the main scientific and technological discoveries they have to be critical and value or balance all the good and bad things about those discoveries. On the whole biotechnological and scientific development make us wonder about many subjects, which nowadays it is difficult to have an answer for tall those questions.

Our descendants and we will have to look after the good performance of those new discoveries. We hope we will be able to use those new discoveries well for our own sake and for nature sake.

 

AIMS

 

The aims of Scientific News and Science fiction are:

1. Let pupils be informed about present great scientific and biotechnological discoveries and developments of those discoveries.

2. Make pupils be interested and develop skills for arguing, keeping a critical attitude and being able to develop their own opinion about recent scientific news, and the application of those discoveries within the fields of feeding, chemists, medicine, etc.

3. Make pupils become aware of the responsibility we all have in relation to any discovery and its application. We all have to look after the correct application of those discoveries in order to protect humanity and preserve the planet.

 

METHODOLOGY

 

1. Each lesson starts reading a tale or seeing a science fiction film, which deals with the subject to be studied afterwards. After that there is a discussion about the tale or film.

2. The teacher explains the main ideas about each subject.

3. Pupils have to look for and bring news from TV, magazines, newspapers, dealing with the subject.

4. Some activities are put into practice in the biology lab if the subject dealt allows.

5. Pupils have to present a debate: Pupils are distributed into different groups for example, genetic engineers or scientists, multinationals, ORG or people who are critical, journalists. That makes the debate more interesting and stimulating. Each group has enough information in order to support their ideas. Besides every group-continues looking for more information about that subject with the help of Internet or other sources of information such as magazines.

6. Debate session. Journalists introduce the subject of that day and the people representing the different options to be supported. Then each group takes their turn to speak. Each group explains their ideas and opinions.

7. Meanwhile one group is explaining their theory, to write down a question or any doubt they have.

8. When all groups have explained their ideas, journalists act as moderators of the debate. So they are in charge of saying whose turn it is and they also ask their own questions.

9. When the debate is over, journalists must summarise the main ideas and conclusions.

10. Each group must summarise their own ideas, translate them into English so that other countries which are interested in the project could know what is going on.

11. After each subject (theme) there is a self-testing sheet.

 

SYLLABUS (INDEX)

 

1. Human Genome.

2. Biotechnology. Clonation. Will human beings be clonated in the future?

3. Genetic engineering.

4. Prions? "Crazy" Cows.

5. Transplantation? Xeno-transplantation. Cell  culture "Superhuman".

 

 

1. Human Genome.

 

Further reading:

 

 

ACTIVITIES

 

A.1.

 

THE HUMAN BODY.

 

- Contains about . . . . . . . . . cells.

- Within each cell there is a corpuscle called . . . . . . . . . . . .

- Within the previous corpuscle there are two complete series of . . . . . . . . .

 (except "sperm" and "ovule" have only one copy and "eritrocites"? have none)

- One series comes from  . . . . . . . . . . . . . and the other one from.

- Each series contains about . . . . . . . . . . . . genes.

- Genes are only . . . . . . . . . %  doesn't decode any characteristic and it is called . . . . . . . .

 

A.2.

 

GENOME IS LIKE A BOOK, WHERE

 

- There are 23 chapters called . . . . . . . . . . . . . . . . .

- Each chapter contains thousands of stories called . . . . . . . . . . . . . .

- Each chapter is made of paragraphs called . . . . . . . . . . . . . .

- With propaganda and advertisements in the middle called . . . . . . . . . . . .

- Each word is written with letters from the genetic alphabetic code called . . . . . . . . .

 

A.3.

 

CHEMICALLY GENOME

 

- It is a very big acid macromolecule called . . . . ………………….. . . .

- That macromolecule is a chain of "monomers" called . . . . . . . . . . . . .

- Each "monomer" is made of 3 sub-units which are  . . . . . . . . . …… .

                                                                    . . . . . . . . . . .

                                                                    . . . . . . . . . . .

- Each of these sub-units are made of letters from the genetic alphabet code which are

                                                                    . . . . . . . . . . .

                                                                    . . . . . . . . . . .

                                                                    . . . . . . . . . . .

                                                                    . . . . . . . . . . .

- These letters are ruled by the law of completion, let's say:  . . . . . . . .    . . . . . . . . . .

                                                                            . . . . . . . ..    . . . . . . . . . .

 

- Following the Law of Completion write the complementary chain of the one written below:

AACGTTGACGAT.

 

 

A.4.

 

26th June 2000, both private and State firms make public [announce] the first draft of Human Genome. With the draft of Human Genome we have entered the post-genomic period. Finishing the sequence of H.G. it is only the beginning, the most difficult is to come, finding genes within genome, decoding "Proteoma" and finding out the function of each gene.

 

What do scientists know up to now?

 

TACCGGGGAACCGTACTTATCACTGAAAATACCTTACTGCCGTAATTGTAATCCGGTAATTAGAGTCCGTGAA

TGCCATACAGTTCTTGTAAGAAGTCATGGTACTTATCTTTCTAAGCGTCTCCACTGTAATCCATTCATGCGGGA

AATTTCAGTGATACAGATAATCGTACTCAGTACTGCTGCTGAGTCCAGCACTTCCGGTAAGTGTAATCTGAAC

GCCGCTAATTACGTACGTAGCGCTATACGTAAAAAGGCCTTCCGGTAATTATACCGGGGAACTTACTGACTG

ACTTATCACTGAAAATACCTTACTGCCGGTAACTACTGCCGGTAATTAGAGTCCGTGAATGCCATACAGTTCT

ACTGGAAGTCATGGTACTTATCTTTCTAAGCGTCTCACTACTGTCCATTCATGCGGGAAATTTCAGTCAGATA

TCACTCTCAGTACTGCTGCTGAGTCCAGCACTTCCGGTAATTACTGTCTGAACTGCCGCTAATTACGTACGTA

CGCTATACAAAGGCCTTCCGGTAATTTACCGGGGAACCTTACTGACTGACTGGTACTTATCACTGAAAATAC

TACTGCCGGTAATTACTGCCGGTAATTAGAGTCCGTGAATGCCATACAGTTCTTATGGAAGTCATGGTACTTA

TTTCTAAGCGTCTCCACTACTGACCATTCATGCGGGAAATTTCAGTGATACAGATAATCACTGTCAGTACTGC

CTGAGTCCAGCACTTCCGGTAATTACTGTCTGAACTGCCGCTAATTACGTACGTAGCGCTATACACTGAAAG

CTTCCGGTAATTACCGGGGAACCTTACTGATCGTACTTATCACTGAAAATACCTTACTGCCGGTAATTGTATG

 

 

Pages and more pages of letters, the letters of the genetic alphabet:

C: Citosine    T: Timine      A: Adenine    G: Guanine.

 

 

 

On this page among plenty of DNA which is repeated and without information, some genes could be identified (they are in italics).

AAAGGCCTTCCGGTAATTTACCGGGGAACCTTGTACTTATCACTGAAAATACCTTACTGCCGGTAAGAGTCCGTG

AATGCCATACAGTTCTTGTAAGAAGTCATGGTACTTATCTTTCTAAGCGTCTCCACTGTAACCATTCATGCGGGAA

ATTTCAGTGATACAGATAATCGTACTCAGTACTGCTGCTGAGTCCAGCACTTCCGGTAAGTGTAATCTGAACTGCC

GCTAATTACGTACGTAGCGCTATACGTAAAAAGGCCTTCCGGTAATTATACCGGGGAACCTTACTGACTGTACTTA

TCACTGAAAATACCTTACTGCCGGTAACTACCGGTAATTAGAGTCCGTGAATGCCATACAGTGAAGTCATGGTAC

TTATCTTTCTAAGCGTCTCCCCATTCATGCGGGAAATTTCAGTGATACAGATTCAGTACTGCTGCTGAGTCCAGCA

CTTCCGGTTCTGAACTGCCGCTAATTACGTACGTAGCGCTATACAAAGGCCTTCCGGTAATTTACCGGGGAAGTAC

TTATCACTGAAAATACCGTACTGCCGGTCCGGTAATTAGAGTCCGTGAATGCCATACAGTGAAGTCATGGTACTTA

TCTTTCTAAGCGTCTACCCATTCATGCGGGAAATTTCAGTGATACAGATAATCACTGTCAGTACTGCTGCTGAGTCC

AGCACTTCCGGTAATTACTGTCTGAACTGCCGCTAATTACGTACGTAGCGCTATACACTGAAAGGCCTTCCGGTAA

TTTACCGGGGAACCTTACTGATCTCTAATTCGGGTACTTATCACTGAAAATACCTTACTGCCGGTAAGAGTCCGTG

AATGCCATACAGTTCTTGTAAGAAGTCATGGTACTTATCTTTCTAAGCGTCTCCAACCTTGACTDTGACCTAATGC

 

However, there are snippets (fragments)within the genes without meaning (non-codified) called intrones,among them there are snippets (fragments) which contain genetic information called exones

AAAGGCCTTCCGGTAATTTACCGGGGAACCTTGTACTTATCACTGAAAATACCTTACTGCCGGTACCGGTAATTAG

AGTCCGTGAATGCCATACAGTGAAGTCATGGTACTTATCTTTCTAAGCGTCTCCACTGTAATCCATTCATGCGGGAA

ATTTCAGTGATACAGATAATCGTACTCAGTACTGCTGCTGAGTCCAGCACTTCCGGTAAGTGTAATCTGAACTGCCGC

TAATTACGTACGTAGCGCTATACGTAAAAAGGCCTTCCGGTAATTATACCGGGGAACCTTACTGACTGTACTTATCA

CTGAAAATACCTTACTGCCGGTAACTCCGGTAATTAGAGTCCGTGAATGCCATACAGTGAAGTCATGGTACTTATC

TTCTAAGCGTCTCCCCATTCATGCGGGAAATTTCAGTGATATCAGTACTGCTGCTGAGTCCAGCACTTCCGGTAATT

ATCTGAACTGCCGCTAATTACGTACGTAGCGCTATACAAAGGCCTTCCGGTAATTTACCGGGGAACCTTACTGACT

GACTGGTACTTATCACTGAAAATACCGTACTGCCGGTAATTACTGCCGGTAATTAGAGTCCGTGAATGCCATACAGT

TCTTACTGGAAGTCATGGTACTTATCTTTCTAAGCGTCTCCAATCGGATCAACTGAACCGTACTGCAATTAGAATGC

 

It is as if you had thousands of pages like the following one, what does it say?

Decode this page:

 

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH         GOODMORNINGEVERYBODYLORDMYSOULGOTHAPPYTHISMORNINGABCDEFI

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

Once you have decoded the page write it, adding the necessary punctuation marks.

 

........................................................................................................................................

 

It is not that simple.

Human DNA has got the genes that make us be like we are.

 

The genes do not even represent a 5% of the whole DNA, the other 95% is DNA uncodified ("dustbin" DNA).

 

One of the tasks that have to come after sequencing the genome is looking for genes and decode them.

In order to help you understand that try to look for the gene in the following bit:

 

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH         HEISABCDETHEBRAVESTMANFGHXYZINTHEWORLDPORSTQWBUTHEISNOTJI

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

 

 

Take out the sentence and write it correctly.

 

..............................................................................................................................................

 

As you could see, the sentence with meaning, gene, is broken into fragments without meaning or sense. Those fragments without meaning are called "nitrons" The fragments with meaning are called "exons". Some "exons" gathered make the gene that determines a protein.

 

A.6.

 

Up to now it was said: a gene = a protein. That meant that a gene determined one protein. Sequencing the genome has changed that belief and also the numbers totally.

So far it was believed that there was a total of 100.000 genes within the human genome. Nowadays it is actually calculated only 38.000 genes.

A study about Human "Proteome" the proteins of our body, allows us to make a calculation of about 200.000 to 300.000 proteins within our "Proteome". It is easy to realise that it is impossible that every gene determines a protein. So it is accepted that every gene can determine more than one protein, everything depends where the reading of the "gene" or "sentence" starts, of the "introns" eliminated (removed), of the "full stops", etc.

To understand this problem a bit look within the fragment of the previous activity other possible sentences.

 

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH         HEISABCDETHEBRAVESTMANFGHXYZINTHEWORLDPORSTQWBUTHEISNOTJI

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

ABCDEFGHIJKLMNOPQRSTUVXYZQWERTYUIOPASDFGHJKLÑZXCVBNMÑLKJH

 

          ...........................................................................................................

        

         ...........................................................................................................

 

         ...........................................................................................................

 

 

A.7.

 

The genome is a very intelligent book because it can photocopy and read itself. Photocopying is known as "REPLICATION" Reading is know as "TRANSLATION"

REPLICATION is done by a property of the four bases, A always matches with T, and G always matches with C. So only one filament could be photocopied itself according to the Saw of Completion.

 

 

 

Reply this fragment:

CTTATCACTGAAAATACCTTACTGCCGGTAATT

 

 

......................................................................

 

 

A.8.

 

Reading a gene or "translation a gene or "translation": How can you translate the language of genes into the language of proteins? DNA is written with 4 letters or basis or nucleotides: A, C, G, T.

Protein is a chain of amino-acids.


One order (DNA) determines another order.

 

How was "genetic code" found in order to translate from one language to the other?.

 

Hypothesis 1. Each base is corresponded by an amino-acid.

There are only 4 bases and 20 amino-acids, then "if a base determines an amino-acid it is not enough. There would be 16 amino-acids to be determined.

 

Hypothesis 2. "Two bases for each amino-acid"

How many combinations can we get?

 

         42 =

 

It is still not enough, there would be 4 amino-acids to be determined.

 

Hypothesis 3. "Each amino-acid is codified with 3 bases"

How may variations could be possible?

Calculate it?

 

         43 =

 

As you can see the result is enough. This means that each amino-acid is determined by a sequence of 3 bases. The group of three bases is called "codo"? The genetic code has 64 "codons". The order of "codons" determines the order of amino-acids.

 

A.9.

 

TRANSLATION 

 

 

 

It is a process with two steps to be followed.

 

1. Transcription: DNA makes a copy of the gene called RNAm.

RNAm uses the same bases, but one of them is different it has Uracil (U) instead of Timine (T). It also changes sugar which is R: "Ribose" (RNA) instead of D: dexoribose of DNA

 

 

 

 

Do the following transcription:

 

DNA:  TACAAACCACTATCAGATACT

RNA:...............................................

 

RNA messenger (RNAm) goes to citoplasm where it is taken in microscopic machines, the "factories" of proteins called "ribosomes".

 

2. TRANSLATION

 

Chart of the 64 "codones".

 

Look at the chart of codones and look for the amino-acids corresponding to the following fragment of RNAm.

 

         AUGUUUGGUGAUAGUCUAUGA

 

         ..................................................