Homework 5 - BICD 100 Spring 2008 Page 1 of 3 S Brody ext...

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BICD 100 Page 1 of 3 S. Brody, ext. 42619 Spring 2008 4125 Muir Biology 1 HOMEWORK SET #5 (Covering lectures #14, 15, 16) Due Friday, May 9, 2008 ***PLEASE PUT YOUR NAME AND SECTION NUMBER IN INK OR TYPED ON TOP OF YOUR HOMEWORK SET*** 30 pts total ( 10 pts ) 1. Cytological polymorphisms are rather common in the human population; chromosome 21 is especially well endowed with polymorphisms. In a very large sample of Down's progeny, 100 cases were encountered in which each parent had one distinctive chromosome 21, and they had one in common; i.e., the cross was of the form ab female ( × ) bc male . a) 4 pts. Indicate the composition of Down's offspring from this type of cross following non-disjunction: i) in the first meiotic division of the mother ii) in the first meiotic division of the father iii) in the second meiotic division of the mother iv) in the second meiotic division of the father Disregard simultaneous non-disjunction (both mother and father). Remember that monosomics are lethal.
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