Assume that you have two recessive traits in dogs, fetching and sitting on comma

Question

Assume that you have two recessive traits in dogs, fetching and sitting on command: the fetching trait in which g fetches and G does not, and the sitting on command trait in which d sits on command and D does not. You cross a male and female that both fetch and sit and have the genotypes GgDd. What fraction of the offspring will neither fetch nor sit? What fraction of the offspring will be GGdd? ***What will be the phenotype of these puppies? What fraction of the offspring will not fetch but will sit on command? ***What are the possible genotypes for these puppies?

Explanation / Answer

** Seems to be a misprint . The cross is between GgDd (do not fetch and do not sit)

GgDd crossed with GgDd

Fraction of fetching and sitting genotype (ggdd)= 1/16

Fraction of offsprings with GGdd = 1/4 * 1/4= 1/16 (These puppies phenotype will be sitting but do no fetch)

c... Genotype of offspring who will sit and not fetch = G_dd

Fraction of such genotype = 3/4* 1/4 = 3/16. Possible genotypes are GGdd and Ggdd.

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