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Answer:

because bill stacy was sick.

Explanation:

Bill Stacy does not have blue skin even though his mother did because of variations that occur during the segregation of alleles after fertilization.

What do you mean by Variations?

Variations may be defined as the altered appearance among individuals in the same population. It is one of the factors that are responsible for maintaining diversity.

Due to variations, offspring do not identical to their parents. These variations have resulted from either erotic reproduction or mutation.

Therefore, Bill Stacy does not have blue skin even though his mother did because of variations that occur during the segregation of alleles after fertilization.

To learn more about Variations, refer to the link:

https://brainly.com/question/14926046

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