AP BIOLOGY

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HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In guinea pigs, the allele for short hair is dominant over the allele for long hair.B = short b = longWhat genotype would a homozygous recessive guinea pig have?
A
BB
B
bb
C
Bb
Explanation: 

Detailed explanation-1: -Short hair is dominant which means it can express in both heterozygous(Hh) and homozygous condition(HH). If all the progeny have short hair, then the parents should have been either: HH x HH OR HH x Hh OR HH x hh.

Detailed explanation-2: -Genetics One affects coat length. Guinea pigs which are homozygous for the dominant form of this gene (ie which have a pair of dominant genes) have short hair. Peruvians (and other long-haired breeds) are homogygous for the recessive form of the gene which causes the abnormally long hair growth.

Detailed explanation-3: -In guinea pigs, short fur (S) is dominant, and long fur (s) is recessive. A female guinea pig with short fur is mated with a male with long fur. Half of the guinea pigs in the litter have short fur, and the other half have long fur.

Detailed explanation-4: -b Bb bb Bb bb Parent genotypes are Bb and bb. Posible offspring genotypes are Bb and bb.

There is 1 question to complete.
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