Biology Principles of Inheritance and Variation All Topic Question For Revision Test Single Correct MCQ
Published on: August 21, 2026

In four o’ clock plants, the gene for red flower colour (R) is incompletely dominant over the gene for white flower colour (r), hence the plants which are heterozygous for flower colour (Rr) have pink flowers. What will be the ratio of offspring in a cross between red flowers and pink flowers?

A
75% red flower, 25% pink flowers
B
All red flower
C
50% red flower, 50% pink flower
D
Red: pink: white: : 1 : 2 : 1

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