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Punnett square to predict what the offspring will look like

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Solve all of these problems using a Punnett Square. If you cannot reproduce the square using software, then you may do them by hand and scan in the image of your solution and submit all images in the one document.

In the eastern collared lizard, Crotaphytus collaris, commonly known as Mountain Boomers, the genes for length of tail exhibit "incomplete" dominance. Use a Punnett Square to predict the result of a cross between a homozygous Long-tailed and a homozygous Short-tailed Mountain Boomer. Use a Punnett square to predict what the offspring will look like?

In guinea pigs, black coat color (A) is dominant over white (a), short hair (B) is dominant over long (b), and rough coat (D) is dominant over smooth (d). Show the Punnett Square for a cross between a homozygous black, short-haired, rough coat guinea pig and a homozygous white, long-haired, smooth coat guinea pig. What do the offspring look like?

Color-blindness is a sex-linked recessive trait. A woman of normal vision, whose father was color-blind marries a man of normal vision whose maternal grandfather was color-blind. What type of vision will be expected in their children?

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Solution Summary

This solution carefully utilizes a Punnett square to predict what the offspring will look like.

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Genetics - Genotypes, Punnett Squares

In fruit flies, the phenotype for eye color is determined by a certain locus. E indicates the dominant allele and e indicates the recessive allele. The cross between a male wild type fruit fly and a female white-eyed fruit fly produced the following offspring.

Wild-type Wild-type White-eyed White-eyed Brown-eyed
male female male female female
F1 0 45 55 0 1

The wild-type and white-eyed individuals from the F1 generation were then crossed to produce the following offspring.

F2 23 31 22 24 0

(a) Determine the genotypes of the original parents (P generation) and explain your reasoning. You may use Punnett squares to enhance your description, but the results from the Punnett squares must be discussed in your answer.
(b) Use a Chi-squared test on the F2 generation data to analyze your prediction of the parental genotypes. Show all your work and explain the importance of your final answer.
(c) The brown-eyed female in the F1 generation resulted from a mutational change. Explain what a mutation is, and discuss two types of mutations that might have produced the brown-eyed female in the F1 generation.

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