In man, brown eyes (B) are dominant over blue (b) and dark hair (R) are dominant to red hair (r). A man with brown eyes and red hair, whose father was blue eyed, marries a woman with blue eyes and dark hair whose mother was red haired. They have four children. Give the genotypic outline and phenotypes of the parents and children.

In man , the blue eye colour is recessive to the brown eye colour . If the boy has brown eye and his mother is blue eyed, what would be the phenotype of his father ?

In human, attached earlobes are a dominant feature over free earlobes while hypertrichosis (Y-linked) feature. A man with attached earlobed and extensive hair on pinna married a woman having free earlobes. The couple had one son with free earlobes and hairy pinna and two daughters with attached earlobes. One of the daughters with attached earlobes. One of he daughters married a man with free earlobes and sparse hair on pinna. They had two sons. What would be the characteristics of their ponnae ?

Suppose a box contains a set of n balls (n gt 4) (denoted by B )of four different colours (many have different sizes), viz,red, blue, green and yellow. Show that a relation R defined on B as R={(b_1,b_2) : "balls" b_1 "and" b_2 have the same colour} is an equivalence relation on B. How many equivalence classes can you find with respect ot R ?