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Problem Set 1_Key

# Problem Set 1_Key - Biology 202 Problem Set 1 This problem...

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Biology 202 Problem Set 1 1/21/11 This problem set covers material from January 10 th through January 24 th From Griffiths et al.: Chapter 1, problems 5, 6, 8, 9, 17, 19 Chapter 2, problems 2, 3, 9, 11, 13 Chapter 3, problems 7, 15, 16, 18, 20, 35, 36 Chapter 7, problems 1, 2, 3, 5, 18, 19, 24, 26, 27 Hand in answers to the following questions, due at 4:00 pm on January 28 th 1. You’re working in a lab that studies a particularly fetching bird from Brazil. This bird has a diploid number of 20 chromosomes in its somatic cells, consisting of 10 homologous pairs (i.e. 10 maternal and 10 paternal chromosomes). Another student in your lab tells you that only one-fourth of the gametes produced by meiosis in this bird will have all of it’s chromosomes from either maternal or paternal origin (i.e. all the chromosomes from dad or all the chromosomes from mom). Assume that meiosis in this bird works just like meiosis in organisms we’ve talked about in class and explain whether you think your lab buddy is correct. The probability that the first chromosome is derived from either the mother or the father is 1 (it has to come from one or the other). The probability that the second chromosome comes from the same parent as the first is ½, the probability that the third chromosome comes from the same parent as the first is also ½ and so on for all the chromosomes. Therefore, the probability that the ten chromosomes in a gamete come from one parent is (1)(½)(½)(½)(½)(½)(½)(½)(½)(½) = 1/512. Therefore, the lab buddy is

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Problem Set 1_Key - Biology 202 Problem Set 1 This problem...

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