Why is a man unable to pass on a sex linked gene to his son?

What is meant by linked genes?

Name one sex linked recessive disease.

Why is a man called an omnivorous animal?

There are five colleges in a city. In how many ways can a man send 3 of his sons to a college, if no two of his sons are to read in the same college ?

A man who had a plot in the shape of a parallelogram divided it into three equal parts and gave one-third part to his son which again was in the shape of a parallelogram. The son seeing that there was no school in the village he decides to open a school there. Answer the following questions: Was the son's decision right?

In the following pedigree chart, state if the trait is autosomal dominant, autosomal recessive or sex linked. Give a reason for your answer.

Solve it graphically : The age of Sanjay is 4 times the age of his son. 5 years hence the age of Sanjay will be three times the age of his son. Find their present ages.

Why is Balanoglossus called a connecting link between echinodermates and chordates.