Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
The gene for haemophilia is present on $X$-chromosome. $A$ male has only one $X$-chromosome which he receives from his mother and $Y$-chromosome from father. The human male passes the $\mathrm{X}$ chromosome to his daughters but not to the male progeny (son).
A marriage between normal visioned man and colourblind woman will produce which of the following types of offsprings
A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is
Sicklecell anaemia is
If a man who is colour blind marries a women, who is pure normal for colour vision, the chances of their sons have colour blindness is
Which of the following occurs due to the presence of autosome linked dominant trait?