NEET BIOLOGY

GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

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

What genotype is present most among the progeny (F2) of a dihybrid cross (AaBb x AaBb)?

A	AaBb
B	AAbb
C	aaBB
D	AABB

Explanation:

Detailed explanation-1: -The heterozygous progeny is formed when these gametes fuse together. As a result, all of the offspring are Heterozygous AaBb. The ratio of F, genotypes between AABB, AaBB, Aabb, and aabb in a hybrid between AABB and aabb would be 1 : 2 : 2 : 1.

Detailed explanation-2: -The F2 progeny of Mendel’s dihybrid cross exhibit four different phenotypes: round yellow, round green, wrinkled yellow and wrinkled green. There are 9 different genotypes: RRYY, RRYy, RrYY, RrYy-4 genotypes of the round yellow phenotype. RRyy, Rryy-2 genotypes of the round green phenotype.

Detailed explanation-3: -This can relate to a single trait or a combination of several or all of the traits of the individuals. As a result, the right answer is ‘1:2:2:1’.

Detailed explanation-4: -Total phenotpic combination= 16. Thus, the correct answer is option C. Was this answer helpful?

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