In Jackalopes, fur color is cream, yellow, brown or black. Three matings of true-breeding Jackalopes (P1...

In Jackalopes, fur color is cream, yellow, brown or black. Three matings of true-breeding Jackalopes (P1 parents) gave information on how these fur color are inherited:

Cross P1 parents F1 offspring F2 offspring

(True-Breeding)

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A Black x brown All black 3/4 black; 1/4 brown

B Yellow x brown All black 9/16 black; 3/16 brown; 3/16 yellow; 1/16 cream

C Black x yellow All black 3/4 black; 1/4 yellow

Fur color is inherited in the same way for all members of the Jackalope species and so, based on this data, how many genes control coat color?

	a.	1
	b.	2
	c.	1
	d.	3

Expert Solution

Ans: As represented in the B cross that F2 offsprings are showing duhybrid cross phenotypic ratio which is 9:3:3:1 which means that coat color is ocntrolled by two genes.To prove this let's suppose A and B are those two genes controlling the coat color and for black the possible genotype can be A_B_ because its ratio is the highest, for brown color the possible genotype can be A_bb, for yellow the possible genotype is aaB_ and for cream color the genotype is aabb.

True Breeding Parent	Genotype
Black	AABB
Brown	aaBB
Yellow	AAbb

Now all the crosses are represented in the image enclosed below:

So from the images enclosed above we can say that if we consider two genes controlling coat color then all the results are being satisfied.

Hence option B is correct.

gladiator answered 3 years ago

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