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In this case neither Pete nor Jack can be the father.

A baby inherits one allele from each of its parents. This means that it will receive one G or g and one B or b from each parent.

If Pete only has gb gametes - (meaning his genotype is ggbb) - then it is not possible for him to give a B to the baby.

The same goes for Jack, whose gametes are Gb (meaning his genotype is GGbb).

Neither of these men have a B - which means that they cannot be the father. The father would have to have BB or Bb for his child to have the genotype BB.

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13y ago

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