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.