Genetics and Southwestern University

Topics: Genetics, Genotype, Gene Pages: 3 (722 words) Published: April 22, 2014
Assume that plant weight is determined by a pair of alleles at each of two independently assorting loci (A and a, B and b) that are additive in their effects. Further assume that each allele represented by an uppercase letter contributes 4 g to weight and that each allele represented by a lowercase letter contributes 1 g to weight. If a plant with genotype AA BB is crossed with a plant with genotype aa bb, what weights are expected in the F1 progeny?

A.1 g
B.4 g
C.8 g
****D.10 g
Phenotypic variation in tail length of mice has the following components:

What is the broad-sense heritability of tail length?

A.0.45
B.0.38
C.0.72
D.0.69
A genetics researcher determines that the broad-sense heritability of height among Southwestern University undergraduate students is 0.90. Which of the following conclusions would be resonable?

A.Because Sally is a Southwestern University undergraduate student, 10% of her height is determined by nongenetic factors. B.Ninety percent of variation in height among all undergraduate students in the United States is due to genetic differences. C.Ninety percent of the height of Southwestern University undergraduate students is determined by genes. D.Ten percent of the variation in height among Southwestern University undergraduate students is determined by variation in nongenetic factors. E.Because the heritability of height among Southwestern Unversity students is so high, any change in the students' environment will have minimal effect on their height. A genetics researcher determines that the broad-sense heritability of height among Southwestern University undergraduate students is 0.90. Which of the following conclusions would be resonable?

A.Because Sally is a Southwestern University undergraduate student, 10% of her height is determined by nongenetic factors. B.Ninety percent of variation in height among all undergraduate students in the United States is due to genetic differences. C.Ninety...
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