Question

Mendel’s experiments with pea plants demonstrated the law of dominance: traits are inherited as dominant and recessive alleles, and the dominant allele for a trait can mask the presence of the recessive allele. Occasionally, that law is contradicted: offspring exhibit a blend of their parents’ traits. For example a red flowering plant when crossed with a white flowering plant would produce a plant with pink flowers. In a genetic cross between a homozygous red flowering plant and a heterozygous pink flowering plant, predict the probability of having offspring with red flowers.
A 0%
B 25%
C 50%
D 100%

Answer 1

C — 50%.

Using R = red, r = white (incomplete dominance: RR = red, Rr = pink, rr = white). Cross RR × Rr gives offspring genotypes: 50% RR (red) and 50% Rr (pink).