The disease 'Haemophilia' is caused due to the lack of:

Both husband and wife have normal vision,though their fathers were colour blind and their mothers did not have any gene for colour blindness. The probability of their daughters becoming colour blind is (in $\%$)

Which of the following disorders is caused by a qualitative defect in the synthesis of globin molecules, leading to impaired $O_2$ transport?

Pedigree analysis is $NOT$ useful for which of the following purposes?

In sickle cell anaemia,the death is caused when the lethal genes are present in

Give differences: Mendelian disorders and Chromosomal disorders.