2. The inheritance pattern for coat color of two Independent genes in rats is th

Question

2. The inheritance pattern for coat color of two Independent genes in rats is the following: ABGray bb Yellow aa B Black Cream There is a third gene on a separate chromosome which determines if color is produced in the fur with deposition of color Cand no color (albino) cc. Predict the phenotypes and genotypes of the parents which would produce the following offspring. A) 9/16 Gray, 3/16 Yellow, 3/16 Black, 1/16 Cream B) 9/16 Gray, 3/16 Yellow, 4/16 Albino C) 27/64 Gray, 16/64 Albino, 9/64 Yellow, 9/64 Black, 3/64 Cream 3. Breeders are studying the inheritance of beards in goats. They have a herds of pure breeding bearded goats and also pure breeding beardless goats and make the following crosses Parents:Bear F1 F2 ded Female Beardless Male All Males are Bearded, all Females are Beardless 1/8 Beardless Males 3/8 Bearded Males 3/8 Beardless Females 1/8 Bearded Females Öffer a hypothesis that explains the results. Define phenotypes and genotypes and diagram the crosses using appropriate notation. Explain these results and propose a cross that could help to confirm your hypothesis.

Explanation / Answer

2)A)the ratio of 9:3:3;:1 is expressed when the two different genotype are crossed together the 9 Signofies the dominant gene appearance that is in this case AABB and AaBb while the two 3 symbolises the aaBband the other 3 AaBb and the 1 symbolises aabb.hence the genotype for grey will be AABB and AaBb.for yellow is Aabb and for black is aaBb and for cream aabb.t he genotypes of parents would be AaBb crossed with the AaBb.

B)to produce the albino gene recessive gene should be present in the both parents to express it in the progency

Hence the genotype of parents would be Cc crossed with Cc and AaBb with AaBb.

C)when the three genes are crossed together we get the ratio 27:16:9:9:3 when the heterozygous alleles are crossed AaBbCc crossed with AaBbCc.

3)

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