In a survey of the children of same parent of a family, the ratio of normal male child: hemophilic male child is 1:1 and all the female child are normal. Find out the genetic make up of their parents.

Write down the probability of a male child to be haemophilic when his father is haemophilic but mother is normal.

Calculate the probable change of being a haemophilic female child if a haemophilic male is married to a normal female

First child of a normal male and female is albino, what are the chances of second child to be albino:

A couple has two children, (i) Find the probability that both children are males, if it is known that at least one of the children is male. (ii) Find the probability that both children are females, if it is known that the elder child is a female.

John has x children by his first wife,. Mary has (k + 1) children by his first husband , they marry and have children of their own, The whole family has 24 children . Assuming that two children of the same parents do not fight. The maximum number of fight is lambda , then lambda/191 is......

In family there are 5 children. Find the probability that (i) all of them will have different birthdays (ii) two of them will have the same birthday and (iii) at least two of them will have the same birthday (1 year = 365 days).

In humans, red-green colour blindness is recessive and sex-linked, while albinism is recessive and autosomal. A marriage between two homozygous parents a normal visioned albino woman and a colour blind and normally pigmented man will produce children 1. who are all phenotypically normal visioned and have normal pigmentation 2. half of whom are colour-blind and the other half having normal vision and all of them having normal pigmentation 3. all of whom have normal vision, but half of whom are albino and the other half with normal pigmentation. 4. of four categories, normal visioned, pigmented, normal visioned, albino, colour blind, pigmented, colour blind, albino, all in equal proportions

Haemophilia is a sex linked recessive disorder of humans. The pedigree chart given below shows the inheritance of Haemophilia in one family. Study the pattern of inheritance and answer the questions given. (a) Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart. (b) A blood test shows that the individual 14 is a carrier of haemophilia. The member numbered 15 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male ? Show with the help of Punnett square.