Project #8619 - blueprint of life #2

For Questions 1 and 2, circle,highlight or bold the alternative a, b, c, or d that best answers the question.

1. 20% of all bases in a strand of DNA are guanine. From this you would expect the percentage of adenine to be: 

(a) 10%

(b) 20%

(c) 30%

(d) 40%.

2. Part of a strand of DNA has the following sequence of bases. The base sequence of the complementary DNA strand would be: 

A A T C C G G T A

(a) AAT CCG GTA

(b) CCG AAT TGC

(c) TTA GGC CAT

(d) TTA CCG GAT.

3. Meiosis is the name of the nuclear division that occurs during the production of gametes. 

(a) Draw a series of six diagrams to illustrate the stages involved in meiotic division occurring in a cell containing two pairs of homologous chromosomes. Colour code the chromosomes using blue for the paternal chromosome and red for the maternal chromosomes.

Stage 1—diploid cell

Stage 2

Stage 3

Stage 4

Stage 5

Stage 5—gametes

(b) The gametes you have drawn at step 6 are not the only possible gametes that can be formed. Name the two processes that could result in different gametes being produced in stage 6 and draw a diagram to illustrate the gametes that would result.

Process of meiosis producing these gametes -

Process of meiosis producing these gametes -

4. What led Boveri and Sutton to independently make the link between chromosomes and the inheritance of genes? 

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5. The phenotype of an organism is determined by both the environment and genotype. 

Outline two specific examples that you have studied that illustrate the effect of the environment on phenotype.

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6. Below is a diagram depicting a short length of DNA.

(CONTACT ME)

(a) What three major components of DNA do the symbols A, B and C represent?

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(b) Describe one modification that could be made to the diagram to make it a more accurate depiction.

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7. What part does each of the following play in protein synthesis? 

(a) DNA

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(b) messenger RNA

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(c) transfer RNA

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(d) ribosome

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8. Mutations are a source of new alleles in organisms. 

(a) Define a mutation.

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(b) Outline evidence for the mutagenic nature of radiation.

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(c) Given the original DNA and the mutated DNA form:

Original DNA

TCA CAG GCG AGT TCT CAT

Mutated DNA

TCA CAG CGCG AGT TCT CAT

discuss the change that this type of mutation would have on the protein produced by the gene containing this base sequence.

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9. Describe the concept of punctuated equilibria highlighting how it differs from the process proposed by Darwin. 

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10. Rosalind Franklin was not awarded the Nobel Prize along with Watson, Crick and Wilkins for discovering the structure of DNA. Do you think this was fair? Justify your answer with reference to their work and the importance of collaboration and communication in scientific research. 

11. Transgenic species are being produced more frequently and have caused a considerable amount of controversy. 

(a) How are transgenic species produced?

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(b) Give one example of transgenic species production to illustrate its use in:

agriculture

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the control or treatment of disease

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(c) Discuss one ethical concern that could be raised concerning the use of transgenic species.

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12. For a named species, evaluate the potential impact of the use of reproduction technologies on its diversity. 

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NO PLAGERISM, ABOVE 50% is all i need

Subject Science
Due By (Pacific Time) 07/08/2013 12:00 am
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