Susan and Lon both have brown hair, but they have a blond-haired child. This is possible because Multiple Choice both Susan and Lon passed on a dominant gene for brown hair. both Susan and Lon passed on a recessive gene for blond hair.
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If blonde hair is dominant and designated as "b" and brunette hair is recessive and designated as "b," probability would predict that if a couple each with a "bb" hair color genotype had four children, _____ would have blonde hair.
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A couple has three children, two of whom have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family? a. Blonde hair is a sex-linked recessive gene b. It is an autosomal recessive trait c. It is an autosomal dominant trait d. It conveys a lethal mutation e. It is a sex-linked dominant trait.
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2. Brown hair is caused by a dominant allele (B); blond hair is caused by a recessive allele (b). Two people with Brown hair are carriers for the blond trait. a. What is the chance their first child will be blond? b. What is the chance their second child will be blond? c. What is the chance they will have a child who is heterozygous? d. What is the chance this couple will have a child with brown hair? e. What is the chance a child will be homozygous dominant?
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