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October_8_Chapts_14-15_FULL

October_8_Chapts_14-15_FULL - Sample Genetics Problem In a...

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Sample Genetics Problem In a certain mouse species, eye color is determined by a single autosomal gene with two alleles that show incomplete dominance: (R) for red eyes versus (r) for white eyes. In turn, the ABO blood system applies to this mouse. A red-eyed, type AB female is crossed with a doubly heterozygous, type A male. Predict the phenotypes and phenotype frequencies of their offspring.
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Practice problems for next week Using the forked line method, determine the phenotypic ratios of the trihybrid cross AaBbCc X AaBBCC. 1. What proportion of the progeny have the dominant phenotype for A, B, and C? 1. What proportion of the progeny are recessive for A, but dominant for B & C? 1. What proportion of the progeny are homozygous recessive at all loci?
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Practice problems for next week The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring would have the following phenotypes?
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