In a certain plant, red flowers are dominant over white flowers.

In a certain plant, red flowers are dominant over white flowers.

A plant heterozygous for red flowers and a plant with white flowers are crossed.

Which of the following is the expected proportion of phenotypes in the next generation?

A.
3 red, 1 white

B.
1 white, 3 red

C.
2 red, 2 white

D.
4 white

Correct Answer : C

The correct answer is:

C. 2 red, 2 white

Explanation: In this cross, we have a heterozygous plant for red flowers (Rr) and a plant with white flowers (rr).

The possible genotypes from the cross would be:

• Rr (red) × rr (white)

The offspring will have the following possible genotypes:

• Rr (red)
• Rr (red)
• rr (white)
• rr (white)

Thus, the expected phenotypic ratio in the next generation would be 2 red to 2 white, or 1 red : 1 white.