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. 1 red, 3 white
B. 4 red, 0 white
C. 2 red, 2 white
D. 3 red, 1 white
The law of segregation states that each individual has two alleles for each trait, and these alleles separate during gamete formation. The allele that each gamete receives is random. Therefore, the probability of getting a certain genotype or phenotype depends on the Punnett square. In this case, the plant heterozygous for red flowers has the genotype Rr, where R is the dominant allele for red flowers and r is the recessive allele for white flowers. The plant with white flowers has the genotype rr. half of the offspring will have the genotype Rr and half will have the genotype rr. Since R is dominant over r, the offspring with Rr will have red flowers and the offspring with rr will have white flowers. Therefore, the expected proportion of phenotypes in the next generation is 2 red, 2 white.
Therefore, the Correct Answer is C.
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