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Corn plants may be tall (TT or Tt) or short (tt). The breeding of two parent corn plants results in offspring that are all tall. What is the probability that both of the parents in this example are homozygous recessive?

Responses
A 0%0%
B 25%25%
C 75%75%
D 100%

1 answer

To determine the probability that both parent corn plants are homozygous recessive (tt), given that the offspring are all tall, we need to analyze the genetic possibilities.

  1. Tall plants can be either homozygous dominant (TT) or heterozygous (Tt).
  2. The short phenotype (tt) can only be produced by homozygous recessive parents.

If both parents are homozygous recessive (tt), all offspring would have to be short (tt), which contradicts the observation that all offspring are tall.

Since all offspring are tall, at least one of the parents must be either TT or Tt. Therefore, the probability that both parents are homozygous recessive (tt) is 0%.

The correct answer is: A. 0%