NEET BIOLOGY

GENETICS AND EVOLUTION

INHERITANCE AND VARIATION

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

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

A	100% Pp (purple)
B	50% Pp (purple); 50% pp (white)
C	75% Pp (purple); 25% pp (white)
D	25% PP, 50% Pp, 25% pp75% purple, 25% white

Explanation:

Detailed explanation-1: -Answer and Explanation: In this situation, every offspring produced from this cross with be a heterozygote (Pp), and because purple is dominant to white, all the offspring will be purple. Therefore, the probability of an offspring having white flowers is zero.

Detailed explanation-2: -When a heterozygous purple flower (Rr) is crossed with a recessive white flower (rr), the progeny obtained are with the genotype (Rr), (Rr), (rr) and (rr). So, 50% of the progeny are with purple flowers (Rr) and 50% are with white flowers (rr).

Detailed explanation-3: -Complete answer: That is, homozygous or heterozygous. If we cross the heterozygous plant, Vv, with the homozygous recessive white vv, the possible combinations in the offspring are only two: Vv or vv. This means 50% of the offspring will be Violet (heterozygous) and 50% would be white (homozygous).

There is 1 question to complete.