8. Albinism in humans is inherited as a simple recessive trait. Determine the genotypes of the parents and offspring for the following families. When two alternative genotypes are possible, list both. Family A. Two non albino parents have five children, four normal and one albino. Family B. A normal male and an albino female have six children, all normal pigmentation.
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Family A: Two non-albino parents have five children, four normal and one albino. - The parents must both be carriers of the recessive allele to produce an albino child. Show more…
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Albinism in humans is inherited as a simple recessive trait. For the following families, determine the genotypes of the parents and offspring. (When two alternative genotypes are possible, list both.) (a) Two normal parents have five children, four normal and one albino. (b) A normal male and an albino female have six children, all normal. (c) A normal male and an albino female have six children, three normal and three albino. (d) Construct a pedigree of the families in (b) and (c). Assume that one of the normal children in (b) and one of the albino children in (c) become the parents of eight children. Add these children to the pedigree, predicting their phenotypes (normal or albino).
Nicole L.
In the human species, albinism is inherited as a simple recessive trait. For the following families, determine the genotypes of the parents and descendants. (When there are two possible alternative genotypes, please indicate both). a. Two normal parents have five children, four normal and one albino. b. A normal male and an albino woman have six children, all normal. c. A normal male and an albino woman have six children, three normal and three albinos. d. Draw the genealogy of families (b) and (c). Suppose that one of the normal children of (b) marries an albino child of (c) and they have eight children. Expand the genealogy to include them, predicting their phenotypes (normal or albino).
Bryan V.
Albinism is a recessive trait in humans (see the introduction to Chapter 1). A geneticist studies a series of families in which both parents have normal pigmentation and at least one child has albinism. The geneticist reasons that both parents in these families must be heterozygotes and that albinism should appear in 14 of their children. To his surprise, the geneticist finds that the frequency of albinism among the children of these families is significantly greater than $14 .$ Can you think of an explanation for the higher-than-expected frequency of albinism among these families?
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