Haemophilia is more commonly seen in human males than in human females because -

Which of the following is not a hereditary disease ?

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt