BIO 202 HW 2 - BIOL 202 Student's Name____...

BIO 202 HW 2
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BIOL 202 Student’s Name____ KEY______________________ HOMEWORK #2 Section number and TA’s name:_________________ DUE: Feb 7/8 in your discussion section. IMPORTANT: Please type (not hand-write) your answers onto the question sheet itself (this sheet). Please highlight or otherwise indicate the parts that you have typed with underlining or bold ing. If additional working is required, it will be specifically stated so in the question, and whether the working should be shown on the answer sheet or a supplemental sheet will also be stated. (2 points) See attached page 1 Point for crossover, 1 Point for both parental centromeres segregate together 2. The diploid chromosome number in humans is 46 (23 pairs), and one member of each chromosome pair is present in each gamete. a. If we ignore for now the possibility of crossing over, how many different combinations of maternal and paternal chromosomes can be found in human gametes? N=23, you can come up with million of different combinations such as #1M, #2P, #3P, #4P, #5P, #6P, #7P, #8P, #9P, and so on to the last chromosome, #23P. The formula is: Possible combinations = 2 n , here it would be 2 23 = 8,388,608 (Assuming no crossing-over)
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