One hundred black guinea pigs were crossed to white guinea pigs, the offspring w

Question

One hundred black guinea pigs were crossed to white guinea pigs, the offspring were then crossed to yield an F2 generation. In 85 of the crosses, the F1 individuals were all black and in the F2 generation that followed black and white guinea pigs appeared in a 3 black: 1 white ratio. In the other 15 crosses, half of the F1 animals were black and half were white. Please provide a genetic explanation of the phenomena described above. What offspring ratios would you expect from crossing the F1 offspring of the guinea pigs from the 15 exceptional crosses? wn barbaloots have three traits that characterize their coat: hair length, shape, and color. Hair length is ermined by the H and h alleles, with long hair, H, being dominant over short hair, h. The shape of each is either curly, T, or straight, t, with curly dominant over straight. Brown hair, B, is dominant white, b. A.How many different type of gametes will be produced by a barbaloot female with Hh Tt BB genotype? What proportion of gametes from a Hh Tt BB parent will be h TB? From the trihybrid cross. Hh Tt Bb x Hh Tt Bb, what Proportion of progeny do you expect to be 1. Homozygous dominant? 2 Phenotypically like their parents? 3. Genotypic ally like their parents?

Explanation / Answer

the ones that were white would have had a homozygous white gene or a hetero zygous gene where the white gene was dominant over the black one.

in the second case the black gene would have been homozygous and thus black was the phenotype or the hererozygous condition where the black was dominant over white.

2. black, white and grey would be the phenotypes after the cross

A. 8 gametes

b. 9 gametes

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