Understanding Concepts For Labrador retrievers, black fur colour is dominant ove

Question

Understanding Concepts For Labrador retrievers, black fur colour is dominant over yellow. (a) What would be the genotype of a homozygous black dog? a heterozygous black dog? (b) Could the heterozygous black dog have the same genotype as a dog with yellow fur? Explain. Applying Inquiry Skills A pea plant with round seeds is cross-pollinated with a pea plant that has wrinkled seeds. For the cross, indicate each of the following: (a) the genotypes of the parents if the round-seed plant is heterozygous (b) the gametes produced by the round-and wrinkled-seed parents (c) the genotypes and the phenotypes of the F_1 generation (d) the genotypes and phenotypes of the F_2 generation, if two round-seed plants from the F_1 generation are cross- pollinated For Dalmatian dogs, the spotted condition is dominant over non- spotted. (a) Using a Punnett square, show the results of a cross between two heterozygous parents. (b) A spotted dog mates with an unknown father. From the appearance of the pups, the owner concludes that the male was a Dalmatian. The owner notes that the female had six pups, three spotted and three non-spotted. What are the genotype and phenotype of the unknown male?

Explanation / Answer

1. (A). Homozygous black male will be BB and Homozygous Yellow female will be bb. So, Puppies will be look like 100% black

(B). No, because black is dominant, So, if a dog has a B allele it will be expressed and the dog will be Black.

2. (A). Rr and rr

(B). R, r, r, r

(C). 50% Rr round and 50% rr wrinkled

(D). RR, Rr, Rr and rr

3. (A). DD, Dd, Dd and dd

(B). The unknown male is homozygous non spotted (dd) in 1:1 ratio.

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