homework 3 key - pairs is given below. decibels hours/day...

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Genetics Problem Set 3 1. Four pure-breeding mutant lines, m 1 , m 2 , m 3 , m 4 , all have a bug-eyed phenotype. Crossing m 1 with m 2 gives bug-eyed progeny. All other crosses give normal phenotypes. How many genes are there, and which mutations are part of which genes? These are complementation tests. m 1 and m 2 do not complement, and so these mutations are on the same gene, the other two are on different genes, for 3 genes in total. 2a. Estimate the mean, variance and standard deviation in a population, given the following data set sampled from that population. 8; 10; 2; 5; 11; 6 mean = 7 variance =56/5 = 11.2 standard deviation = 11.2 = 3.3466 2b. If broad-sense heritability H 2 = 0.2 for the data set above, what is V G ? H 2 × V P = 0.2 ×11.2 = 2.24 3. A study of siblings examined their talking habits. The difference in a trait (either decibels or numbers of hours per day spent talking) between different types of sibling
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Unformatted text preview: pairs is given below. decibels hours/day identical twins 0.7 0.1 nonidentical twins 0.8 0.9 identical twins raised separately 4 0.5 adopted sibling pairs 0.9 2.3 Which trait is more heritable and why? #hours per day. Adopted siblings talk very different amounts per day, showing a genetic basis, and identical twins are far more similar than nonidentical. Identical twins raised separately talk at very different volumes, showing an environmental basis. Also difference in volume is very similar for identical twins, nonidentical twins, and adopted siblings. 4. Color-blindness is an X-linked recessive trait. A color-blind woman marries a man with normal vision. What phenotypes do we expect to see in their sons and daughters? Sons will all be color-blind, but no daughters will be colorblind....
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