2)) A lilly from a true-breeding line with white flowers and short corollas (lin

Question

2)) A lilly from a true-breeding line with white flowers and short corollas (line A) is crossed to a lilly from a true-breeding line with black flowers and long corollas (line B). The resulting offspring, the F1, are all red-flowered, with corollas of medium length. Suppose an individual from the F1 is crossed to an individual from line A. The resulting offspring are as follows: 50% white flowers and short corollas, 50% red flowers and medium corollas. What is the term for when one locus affects two or more traits? In the scenario above, how many types of gametes can the F1 plants make?

Explanation / Answer

When one locus affects multiple traits, this is known as pleiotropy. Since the parents of the F1 plants are true-breeding lines for each phenotype, that means the F1 plants are heterozygous for all traits. Thus, they can produce gametes with every combination of color/corolla, so 2^2, or 4 unique types of gametes with respect to these two traits.

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