Choose correct option.

$(i)$ The heterozygous female transmit the disease to son.

$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle like structure.

$(iii)$ Mentally retarded.

$(iv)$ Heamoglobin not formed proper amount in blood.

In pedigree analysis, the square, blackened and horizontal lines represents

Thalassaemia is

Study the pedigree chart given below. What does it show?

A man known to be victim of haemophilia marries a normal woman whose father was known to be a bleeder. Then it is expected that