Question

A man who has pointed ears came to the attention of a geneticist. The geneticist finds the following: Pointy ears are an inherited trait due to a single genetic locus. The man's sister has pointed ears, but his mother, father, his brother, and other sister have normal ears. The man and his normal-eared wife are first cousins and have seven children, including four boys and three girls. Two girls and two boys have pointy ears; the boys with pointy ears are identical twins.

A. Draw the pedigree. Include appropriate symbols and shading for the affected individuals

B. Fill in the genotype of each individual. If the second allele cannot be determined, use a dash.

C. Which one of the following best describes the inheritance of pointy ears in this family?

            Autosomal recessive               Autosomal dominant              Sex-linked

Answer 1

The dominant cellele keepresented by A. The recessive allele represented by 'a. O close related Pointed ear mole Male members (consanguluous ©->Powled eat female 0 -> Femal mating Go Horizontal lines connects mates! - Twins , faveretical lines connects parents Videntical Ch 0 tot generation A Twin wortello (with offspring Ha A and Br que generation The Best describes the inheritance of pointy ears in this family is - Autosomal recessive. It can be proved by above pedigree tree. The rest two options are wrong due to ® Dueto somal dominant-Ist generation parents donot show the touit even though the children (some) ore pointed laves Sex-linked as male in Ist generation donot show this trait even after that his one daughter shows this trait which is not possible.