Question

Punnet squares and butterflies?

In one species of butterfly, there are alleles for red color and blue color, but neither of these alleles is dominant over the other. When a butterfly of this species has both of these alleles, its color is purple In some breeds of cows, there are alleles for brown color and white color. Neither of these alleles is dominant over the other. When a cow of one of these breeds has both of these alleles, its color is brown-and-white spotted (which is also called roan) If a purple butterfly is bred with a purple butterfly, the phenotypes of the offspring will occur in what ratio? (Hint: Construct a Punnett square to help you answer this question.) If a spotted cow is bred with a white cow, the phenotypes of the offspring will occur in what ratio? (Hint: Construct a Punnett square to help you answer this question.) O A 1:2:1 ratio of red, purple, and blue O A 1:1 ratio of red and purple O A 1:1 ratio of spotted and white O A 1:2:1 ratio of brown, spotted, and white A 1:3 ratio of blue and red O A 1:1 ratio of purple and blue A 1:1 ratio of brown and spotted O A 1:3 ratio of white and brown In this species of butterfly, the alleles for color are an example of In these breeds of cows, the alleles for color are an example of

Answer 1

1)

rb (purple) x Rb (purple)

male/female	rb	Rb
rb	rrbb(blue)	rRbb(purple)
Rb	Rrbb (purple)	RRbb(red)

When a purple butterfly bred with purple butterfly 1:2:1 ratio of red, purple and blue will be observed.

In this species of butterfly, the alleles for color are an example of independent assortment.

2)

bw (roan) x ww (white)

male/female	bw	ww
bw	bbww (brown)	bwww(roan)
ww	wwbw (roan)	wwww(white)

The resultant offspring have phenotype 1:2:1 ratio of brown, spotted or roan and white.

In these breeds of cows, the alleles for color are an example of independent assortment.