A family of white tigers is depicted in the following pedigree. In answering the

Question

A family of white tigers is depicted in the following pedigree. In answering the following questions, assume that white is determined by allelic differences at a single gene and that the trait is fully penetrant. Base your answers only on information in the pedigree. If a is true, b is false and c-e are true, enter TFTTT

For the following questions, assume that white tigers are indicated by the unshaded symbols. White coat color could be caused by:

a Y-linked allele.

b. a dominant X-linked allele.

c. a dominant autosomal allele.

d. a recessive X-linked allele.

e. a recessive autosomal allele.

For the following questions, assume that white tigers are indicated by shadedsymbols.
White coat color could be caused by:

a. a Y-linked allele.

b. a dominant X-linked allele.

c. a dominant autosomal allele.

d. a recessive X-linked allele.

e. a recessive autosomal allele.

Explanation / Answer

Based on the pedigree the answer is FFTFF. The reasons are as follows:

a. Y linked- False

The trait is not only passed from father to son but from father to daughter as well.

b. Dominant X- linked allele- False

The trait does not skip generation.

c. Dominant autosomal- True

The frequency of trait in both sexes is equal. Affected offspring is born to one of the affected parents.

d. Recessive X-linked allele- False

The trait is also passed from father to son.

e. Recessive autosomal allele- False

Trait does not skip generation and affected offspring is born to affected parents.

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