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. Two short hair guinea pigs are mated. Out of 100 offspring, 50 of them have LONG hair. What are the probable genotypes of the parents?
A
The genotype of one parent will be heterozygous and the genotype of the other parent will be homozygous recessive.
B
The genotype of one parent will be heterozygous and the genotype of the other parent will be homozygous dominant.
C
The genotype of one parent will be homozygous dominant and the genotype of the other parent will be homozygous recessive.
D
The genotype of both parent will be heterozygous.
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: -In guinea pigs, short hair (S) is dominant over long hair (s). A female guinea pig with short hair but whose father had long hair is mated with a male with long hair but whose parents were both shorthaired. Using a Punnett square, predict the genotypic and phenotypic ratios of their offspring.

Detailed explanation-3: -The offspring receives the genetic material from the parents. Mendelian inheritance is a certain b… In guinea pigs, black hair colour (B) is dominant and brown hair colour (b) is recessive. Long hair (L) is dominant and short hair (l) is recessive.

Detailed explanation-4: -The phenotypic ratio is 3:1 (3 black and 1 white)

There is 1 question to complete.
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