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.

Explanation / Answer

d. a recessive X-linked allele.

Incase of X-linked recessive inheritance, inheritence of one recessive allele is enough to exhibit phenotypic characters in males, whereas females need to inherit both the recessive allels. (If it is X-linked dominant, presence of one or two dominant alleles exhibit phenotypic character, but this is not the case with the given pedegree). Genotype of mohan is, xX, genotype of mohini is xx. Genotypr of kesari is Xx (her father XY) and genotype of tony is xY (his mother xx). Genotype of kamala is Xx, genotype of Bim is xY, genotype of Susmita is xx. Genotype of 1982 female is xx.

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