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AIPMT PRELIMS2004Botany-Principles of Inheritance and Variation

AIPMT PRELIMS 2004 Botany Dihybrid Cross MCQ Question

Type: MCQ-conceptual-Medium-Class 12

In a plant red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RrTt genotype is crossed with a plant that is rtt

A

50% will be tall with red fruit

B

75% will be tall with red fruit

C

All the offspring will be tall with red fruit

D

25% will be tall with red fruit

Correct Answer

Option A

Detailed Explanation

The cross RrTt x rtt results in a 1:1:1:1 phenotypic ratio. 50% of the offspring will have the genotype RrTt or Rrtt, which results in red fruit and tall plants.

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