If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage.Which of the following is correct?
A) All of the offspring (F1) will be short.
B) Over several generations, no short individuals will appear.
C) Some short individuals may appear in the F2 generation.
D) It is impossible to determine based on the information provided.
E) Some of the F1 generation will be short.

Question

Quizplus · Accepted Answer

Since the true-breeding tall pea plant is homozygous dominant for height (TT), it will always pass on a dominant allele for height to its offspring. However, the second parent's genotype is unknown, so it could carry a recessive allele for shortness (tt) that would be masked by the dominant allele in the F1 generation. If this is the case, some of the F1 generation will be carriers of the recessive allele for shortness (Tt). If two of these carriers were to mate in the F2 generation, the probability of producing a short plant (tt) would be 25%. Therefore, it is possible for some short individuals to appear in the F2 generation.

If a True-Breeding Tall Pea Plant Is Crossed with a Tall