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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I don't know what you ask but just think yes
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a funcion called meteroine
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Answer: the antibodies mistakenly identify the cells as foreign material
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