Site Description/Genetics Assignment example

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Site Description/Genetics Assignment

Please address all assignment questions verbally as well as showing Punnett Square work. The ability to curl your tongue up on the sides (T, tongue rolling) is dominant to not being able to roll your tongue. A woman who can roll her tongue marries a man who cannot. Their first child has his father's phenotype. What are the genotypes of the mother, father, and child?

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As a father has a recessive trait he is homozygous recessive and his genotype is tt.A mother has at least one dominant allele, as a child has the recessive trait, her genotype should be Tt.The genotype of the child is tt.The mother is blood type O and the father is blood type A. What are the possible blood types of the offspring?

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The mother's genotype is OO. The father's genotype is either AO or AA. In the first case the genotypes of the offspring are AO or OO; in the second case the genotype of the offspring is AO. Therefore, the offspring may have A or O blood types.In mice, brown eyes (B) are dominant over blue (b). A homozygous brown-eyed male mouse mates with a blue-eyed female and they have offspring. What are the phenotypes and genotypes of their offspring? What are the genotypes of the parents?

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The genotype of the male mouse is BB; the genotype of the female mouse is bb. The offspring has a genotype Bb, which corresponds to the phenotype 'brown eyes.' In some cats the gene for tail length shows incomplete dominance. Cats with long tails are homozygous dominant (TT) and cats with no tails are homozygous recessive (tt). Heterozygous cats have short tails (Tt). For each of the following construct a punnett square and give phenotypic and genotype ratios of the offspring.a) a long tail cat and a cat with no tail

ttTTtTtTTtTt

100% of the offspring has the genotype Tt and the phenotype 'short tail'.b) a long tail cat and a short tail cat

TtTTTTtTTTTt

50% of the offspring has the genotype TT and the phenotype 'long tail'; 50% of the offspring has the genotype Tt and the phenotype 'short tail'.c) a short tail cat and a cat with no tail

ttTTtTtttttt

50% of the offspring has the genotype Tt and the phenotype 'short tail'; 50% of the offspring has the genotype tt and the phenotype 'no tail'.d) two short tail cats

TtTTTTttTttt

25% of the offspring has the genotype TT and the phenotype 'long tail'; 50% of the offspring has the genotype Tt and the phenotype 'short tail'; 25% of the offspring has the genotype tt and the phenotype 'no …

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