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Practice_questions_for_Exam_3_SS12_and_k

Practice_questions_for_Exam_3_SS12_and_k - Exam 3 BS 162...

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Exam 3 BS 162 Spring 2012 Practice exam questions 1. You cross a white rose and a red rose. The first generation of offspring are all red, but in the second generation three flowers are red for every white flower. What most likely happened? A) A new mutation for white flowers appears in the second generation B) Red is more powerful than white and usually wins in the struggle for expression of flower color C) the allele for white flowers is dominant to the red flower allele D) the allele for red flowers is dominant to the white flower allele 2. Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway leading to melanin. Heterozygotes are normally pigmented. Thus, which of the following statements is correct? 3. Imagine a locus with four different alleles for fur color. The alleles are D a , D b , D c , and D d . If you crossed two heterozygotes, D a D b and D c D d , what genotype proportions would you expect in the offspring? 4. Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of the cross BbTt × BBtt will have black fur and long tails? 5) What is the reason that linked genes are inherited together? a. They are located close together on the same chromosome. b. The number of genes in a cell is greater than the number of chromosomes. c. Chromosomes are unbreakable. d. Alleles are paired together during meiosis. e. Genes align that way during metaphase I of meiosis. 6) In a pedigree analysis, carriers can be inferred to occur
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