AP BIOLOGY

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HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Coat color in a dog breed is determined by incomplete dominance where three colors are produced (Brown, tan and white), and the brown coat allele (B) has incomplete dominance over the white coat allele (b). Which offspring ratio would be expected from a cross between a brown dog and a white dog?
A
2 BB:2 Bb
B
4 Bb
C
1 BB:2 Bb:1 bb
D
2 BB:2 bb
Explanation: 

Detailed explanation-1: -Coat color in a dog breed is determined by incomplete dominance where three colors are produced (Brown, tan and white), and the brown coat allele (B) has incomplete dominance over the white coat allele (b).

Detailed explanation-2: -Incomplete dominance occurs when neither trait is truly dominant over the other. This means that both traits can be expressed in the same regions, resulting a blending of two phenotypes. If a white and black dog produce a gray offspring, this is an example of incomplete dominance.

Detailed explanation-3: -An Andalusian chicken (found in Spain) is an example of incomplete dominance. An offspring produced shows incomplete dominance in its feathers as the parents (a white feathered male and a black feathered female chicken) breeds to produce an offspring with blue and tinged feathers.

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