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11. Tim and Christine have freckles (a dominant trait that is not sex linked), but their...

11. Tim and Christine have freckles (a dominant trait that is not sex linked), but their son Michael does not. Use a Punnett square to show how this situation is possible. What is the probability that their next child will have freckles?

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Answer #1

Freckles is an autosomal dominant trait. Let F be the allele causing freckles. Tim and Christine have Freckles and they may be either FF or Ff. But since their child doesnt have freckles. So the parents should be heterozygous (Ff).

The cross between Tim and Christine is shown below:

  

As we can see, one of the possibilities between this cross is ff which will not have freckles. Hence Michael is ff.

A child can have freckles if he is FF or Ff. Hence the probability for their next child to have freckles is 3/4 ( 1FF+2Ff)

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