Help with these genetics questions Help with these genetics questions 11. (0.5pt

Question

Help with these genetics questions Help with these genetics questions 11. (0.5pt) In cats, black coat color is due to a dominant factor (B), white to its recessive allele (b). A black cat mated to a white cat produces a white kitten. If they produce another offspring, what are the chances of it being black? A) 0% B) 25% C) 50% D) 75% E) 100% 12. (0.5pt) A certain type of hairline called a Widow's peak is a dominant autosomal trait. The chance of having a child with a Widow's peak in a cross between 2 heterozygote parents is A) 25% B) 50% C) 75% D) 100%

Explanation / Answer

11. C. 50%

As the black cat produced a white kitten, it must be heterozygous. The other parent must be a homozygous as that is the only condition that allows white coat color. Therefore, in a cross between Bb and bb, 50% of the offsprings should inherit the B allele and consecutively be black.

12. C. 75%

Let's assume the alleles W and w for the dominant and recessive genes for this condition. Both parents have the genotype Ww. A cross between the two would look like:

We see that the chances of inheriting the condition is 3/4ths, or 75%.

W w W WW Ww w Ww ww

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