New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents June 2007 Question 07 PDF Print E-mail
Heredity and Genetics

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Correct Answer: Option 4 recombination of genes within the cell

Genetic recombination is the process by which a strand of genetic material (usually DNA; but can also be RNA) is broken and then joined to a different DNA molecule. In eukaryotes recombination commonly occurs during meiosis as chromosomal crossover between paired chromosomes. This process leads to offspring having different combinations of genes from their parents and can produce new chimeric alleles.

Variation may not be the effect of this kind of change. A change in the base subunit sequence could lead to an alteration of amino acid sequence to be coded to form the proteins of the body.

Evolution cannot take place because the recombination just happened in one organism, not it a population of organisms. Thus, the rate of evolution will not be affected.

The synthesis of antigens to protect the cell may not be the direct effect of the change in the base sequence. It is just one of the thousands, if not millions, probabilities that might happen. Thus, option 3 is not the best answer.
 

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