Question

Mr. and Mrs. Jones have six children. Three of them have attached earlobes (recessive) like their father, and the other three have free earlobes like their mother. What are the genotypes of Mr. and Mrs. Jones and of their numerous offspring?

Answer 1

Answer:

Since you know that attached earlobes (call this a) are recessive, then the 3 children with attached earlobes are aa. The father is also aa. Since the other 3 children have free earlobes, then they must have the dominant allele (A). Since the mother has free (unattached) earlobes, then these 3 children received the dominant allele from her. Also, they have to have received the recessive allele from their father, so the children with free earlobes are Aa. Finally, since the first three children we discussed have attached earlobes and are aa, they must have received one a allele from the father and one a allele from the mother. Therefore, the mother must be Aa.

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