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In some pedigrees, such as this one, the generations
are not numbered, only individuals. How can
individual 7 be unafflicted when both of his parents
are afflicted?

In some pedigrees such as this one the generations are not numbered only individuals How can individual 7 be unafflicted when both of his parents are afflicted class=

Respuesta :

Since the trait is dominant, it is possible for his parents to be heterozygous (Bb). So they have the trait but they have a gene they can pass on with out it. If both of his parents Bb then he could’ve gotten both recessive and therefore not receive the trait
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