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1. Rabbits can have solidor spotted coats, and the base color can either be brown or black.Spotted coat color is dominant to solid, and black is dominant tobrown. A spotted, brown female (whose mother was solid black),mates with a solid, black male (whose parents were homozygous forthe black allele). What are the expected genotype and phenotyperatios for the offspring of this cross? Show your Punnet square toget full credit.

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Elin Hessel
Elin HesselLv2
28 Sep 2019
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Related questions

In a special breed of cats, the dominant allele R causes solid tail color, and the recessive allele r results in white spots on a colored background. The black coat color allele B is dominant to the brown allele b, but these genes can only be expressed if the animal has an mm genotype at a third gene locus. Animals that are M_ are yellow regardless of which allele from the B locus is present. All genes are unlinked.

A mating between a solid yellow-tailed male cat and a solid brown-tailed female cat produces 16 offspring with the following tail phenotypes: six solid yellow, two spotted yellow, three solid black, one spotted black, three solid brown, and one spotted brown.

1. The genotype of the female is likely to be:_________

2. The genotype of the male is likely to be: ___________

3. What is the probability of the next offspring from these same two parents having a spotted brown tail? _________

In the yawncat (a rare hypothetical animal), the dominant allele R causes solid tail color, and the recessive allele r results in white spots on a colored background. The black coat color allele B is dominant to the brown allele b, but these genes can only be expressed if the animal has an mm genotype at a third gene locus. Animals that are M- are yellow regardless of which allele from the B locus is present. A mating between a solid yellow-tailed male yawncat and a solid brown-tailed female yawncat produce 16 offspring with the following tail phenotypes: six solid yellow, two spotted yellow, three solid black, one spotted black, three solid brown, and one spotted brown.

a. What are the most likely genotypes of the male and female parents? Explain the strategy used to determine the genotypes.

b. What is the probability of the next offspring having a solid brown tail?

For each problem I need to know the following plus whateverspecifics the problem requests:

Key: (Which symbol stands for which allele) รขย€ย“ Use the sameletter for a gene using a capital to designate dominant and lowercase to show recessive.

Parental genotypes

Possible gametes for each parent

The Punnett Square

1. In guinea pigs black coat color is dominant to brown coatcolor. A black guinea pig (from a long line of black guinea pigs)is bred to a brown guinea. If one of these offspring is then bredto a different brown guinea pig, what are the expected genotypesand phenotypes of their offspring?

2. In pea plants tall stems are dominant to short stems andpurple flowers are dominant to white flowers. A true breeding plantwith tall stems and white flowers is crossed with a true breedingplant having short stems and purple flowers. The offspring fromthis cross are grown up and allowed to interbreed. What are theexpected genotypes and phenotypes of their offspring?

3. In dogs, black is dominant to golden. You have a blackLabrador retriever you would like to stand at stud, but first youwant to know if it is homozygous black or heterozygous. You make atestcross to determine this. What are the expected genotypes andphenotypes if your dog is heterozygous? If it is homozygous?

4. Color-blindness is X-linked in humans. A color-blind manmarries a woman whose father was color-blind. What are the expectedgenotypes and phenotypes of their children?

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