A girl of normal vision whose father was colourblind marries a man of normal vision whose father was also colourblind. Their sons would be (of total number of $sons$)

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

All sons of a couple are colourblind because

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

Following characters are indicate

$(i)$ presence of sickle - shaped $RBC$

$(ii)$ Blood not clot, non stop bleeding

$(iii)$ The heterozygous female transmit the disease to sons.

$(iv)$ Both heterozygous parents transmit the disease to offspring

Haemolytic jaundice is caused due to a dominant gene but only $10\%$ of the people actually develop the disease. A heterozygous man marries a homozygous normal woman; what proportion of the children would be expected to develop the haemolytic disease