Study the given pedigree chart and answer the questions that follow:

(a) Is the trait recessive or dominant?
(b) Is the trait sex-linked or autosomal?
(c) Give the genotypes of the parents show in generation I and their third child shown in generation II and the first gradchild shown in generation III.

Explanation

(a) The trait is recessive.
(b) Is the trait sex-linked or autosomal ?
(c) It is autosomal recessive (aa). In generation I, female is heterozyogus carrier (a) amnd male is homozygous recessive (aa). In generation II, genotype of 3rd chie is aa (homozygous recessive). In generation III, first granchild is female (homozygous rescessive) wih genotype aa.