Two dogs with black coat color are bred and produce a litter with black, brown,

Question

Two dogs with black coat color are bred and produce a litter with black, brown, yellow, and sable pups. Which of the following genotypes could the two parental dogs have been? Note that dogs with at least one KB allele are solid black or brown, regardless of the K or A alleles.

black brow yellow BB, Bb EE, Ee, EEm, B Locus EmEm, Eme aa E Locus AyAy, Aya, Aya atat, at a K Locus A Locus black K8KB, KBky, KBkor AYAy, Ayar, Ava kyky kbrkbr, kbrky ata, ata a. Bb, Ee, KBky, AyAy and Bb, Ee, KBky, AyAt O b. Bb. Ee, KBky, at and Bb, Ee, kyky, atat a C. BB, Ee, Bky. Ay Ay and Bb, Ee, Bky. AyAt O d. Bb, ee, Kok Aya and Bb, Ee, kyky, AyAt br O e, two of the above are possible genotypes black (left) brown (right) sable (left and right) points black (left) brown (right) brindled points

Explanation / Answer

Option c has BB Hence cannot produce brown(bb) option b has ata and atat which cannot produce Sable (AyAy, Ay,At, Aya) option a and d can produce all of the litter type (black, brown,sable and yellow) Hence answer is e

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