Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes $a$ and $b$ could be of
colour blindness and body height
attached ear lobe and Rhesus blood group
haemophilia and red-green colour blindness
phenylketonuria and haemophilia
The female children of a haemophilic man and a carrier woman are likely to be
Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals Which one of the following conclusions drawn is correct
A man with normal vision whose father was colourblind marries with women whose father was also colourblind. Suppose their first child is daughter then what are the chances of this child to be colourblind?
Give scientific reasons : The product of phenylalanine catabolism excreted in the urine in phenylketonuria.