1. In cats, coat color is controlled by a gene on the X chromosome. Yellow coat...

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Biology

1. In cats, coat color is controlled by a gene on the Xchromosome. Yellow coat color is determined by the b allele andblack coat color is determined by the B allele. The heterozygouscondition results in a color known as tortoise shell.

a. What phenotypic ratio of offspring would be expected from across between a yellow male and a tortoise-shell female?

b. What proportion of the female offspring from a cross betweena black female and a yellow male will be tortoise-shell (so, ignorethe male offspring)?

2. In a certain species of flower, two autosomal genes, C and R,are both involved in flower color. The dominant C allele confersthe ability to produce any color on the petal; cc individuals arewhite no matter what other genes they express. The dominant Rallele produces red petal color; the flowers will be pink if theyhave two copies of the r allele. For the following cross, what isthe phenotypic ratio?

CcRr x Ccrr

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