AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In guinea pigs, the allele for short hair is dominant.If the P1 generation resulted in 3/4 short hair and 1/4 long hair, can you determine the exact genotypes of the parents?
A
Yes, the genotypes of the P1 generation is Ss x Ss. This will result in the offspring being 3/4 short hair and 1/4 long hair.
B
Yes, the genotypes of the P1 generation is SS x ss. This will result in the offspring being 3/4 short hair and 1/4 long hair.
C
Yes, the genotypes of the P1 generation is ss x ss. This will result in the offspring being 3/4 short hair and 1/4 long hair.
D
No, you can not determine the genotypes of the P1 generation.
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 (H) is dominant to long hair (h), and the heterozygous condition when you cross a yellow coat (CY) and white coat (CW) gives you a cream coat. These two loci are located on different chromosomes. A heterozygous short-haired cream guinea pig is crossed with a long-haired white guinea pig.

Detailed explanation-3: -In guinea pigs, coat color is determined by at least three alleles. Yellow is homozygous dominant, two other colors are also possible; white and ecru (cream-colored).

Detailed explanation-4: -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.

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