In guinnea pigs, black eyes are dominant to red eyes. A male guinnea pig that is heterozygous is crossed with a female that is homozygous recessive. What are the expected phenotypes of their offspring?

MONOHYBRID CROSS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	Red Eyed and Black Eyed
B	Only Red Eyed
C	Only Black Eyed

Explanation:

Detailed explanation-1: -If heterozygous black pigs where intercrossed then the the probability that the first two offspring is black is 75%. Explanation: The black colour in case of pigs is the dominant character which is exhibited by most of the similar features.

Detailed explanation-2: -So, the correct option is ‘25%’.

Detailed explanation-3: -If the guinea pig with black coat has all offspring with black coat color, he/she is homozygous with the dominant allele (BB). If the guinea pig with black coat has offspring that are half black coat color and half white coat color, he/she is a heterozygous hybrid (Bb).

Detailed explanation-4: -Thus, proportion of F2 individuals which are heterozygous for both gene pairs (BbRr) = 4/16 = 1/4 or 25%.

There is 1 question to complete.

AP BIOLOGY

HEREDITY

MONOHYBRID CROSS