Bio 130 – Quiz March 30. Q. 1 Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway leading to melanin.

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Bio 130 – Quiz March 30

Q. 1 Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway leading to melanin. Given that heterozygotes are normally pigmented, which of the following statements is/are correct? A.One normal allele produces enough melanin for a normal phenotype. B.Each defective allele produces a little bit of melanin. C.Two normal alleles are needed for normal melanin production. D.The two alleles are codominant. E.The amount of sunlight will not affect skin color of heterozygotes.

Q. 2 Imagine a locus with four different alleles for fur color in an animal. The alleles are named 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? A.25% D a D c, 25% D a D d, 25% D b D c, 25% D b D d B.50% D a D b, 50% D c D d C.25% D a D a, 25% D b D b, 25% D c D c, 25% D d D d D.50% D a D c, 50% D b D d E.25% D a D b, 25% D c D d, 25% D c D c, 25% D d D d

Q. 3 In geckos spotted skin (S) is dominant to stripey skin (s). Long tails (T) are dominant to short tails (t). If we cross a female that is SsTt with a male that is Sstt, what is the chance that an offspring will have stripey skin and a short tail? A.0 B.½ C.¼ D.1/8 E.1/16

Q. 4 In geckos spotted skin (S) is dominant to stripey skin (s). Long tails (T) are dominant to short tails (t). If we cross a female that is SsTt with a male that is Sstt, what is the chance that an offspring will have spotted skin and a short tail? A.0 B.½ C.¾ D.3/8 E.3/16