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Unformatted text preview: GENETICS OCTOBER 6, 2009: IN CLASS PROBLEM SOLVING SESSION 1. DI-HYBRID CROSS Chapter 3: 32 We did not cover the binomial expansion, so you are not expected to be able to calculate the probability as written in the text. We will work this modified question: In mice, an allele for apricot eyes (a) is recessive to an allele for brown eyes (a+). An independent assorting locus, an allele for tan coat color (t), is recessive to an allele for black coat color (t+). A mouse that is homozygous for brown eyes and black coat color is crossed with a mouse having apricot eyes and a tan coat. The resulting F1 are intercrossed to produce the F1. What is the probability of obtaining a mouse with apricot eyes and a tan coat? 2. CHI-SQUARE - Chapter 3: 36 In the 1800s, a man with dwarfism who lived in Utah produced a large number of descendants: 22 children, 49 grandchildren, and 250 great-grandchildren (see the illustration of a family pedigree), many of whom were also dwarfs (F. F. Stephens. 1943. Journal of Heredity 34:229235). The type of dwarfism found in this family is called Schmid-type metaphyseal chondrodysplasia, although it was originally thought to be achondroplastic dwarfism. Among the families of this kindred, dwarfism appeared only in members who had one parent with dwarfism. dwarfism....
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- Spring '08