Homework2_KEY

Homework2_KEY - BIS101/Draper Homework02 KEY 4. (10 pts) A...

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BIS101/Draper Homework02 KEY 1 4. (10 pts) A diploid organism has a 2n chromosome number of 6 (2 pts each). a. How many chromatids will be present at the metaphase stage of mitosis? 12 b. How many pairs of homologous chromosomes will be present during prophase I of meiosis? 3 c. How many chromosomes will be present in a gamete cell? 3 d. How many chromatids will be present in the zygote following fertilization? 6 e. If each maternal-paternal pair of chromosomes carries a single heterozygous gene (a pair of alleles), how many different gamete genotypes are possible? Number of possible gametes = 2 n , where n = number of independently segregating genes. Therefore 8 different gamete genotypes are possible 5. (12 pts) Answer the following using no more than a single sentence (2 pts each): a. What is the function(s), if any, of the cohesion complex during meiosis I? The cohesion complex 1) holds sister chromatids together during prophase and 2) assures sister chromatids segregate to the SAME pole
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This note was uploaded on 04/05/2012 for the course BIS 101 taught by Professor Simonchan during the Spring '08 term at UC Davis.

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Homework2_KEY - BIS101/Draper Homework02 KEY 4. (10 pts) A...

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