Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

A person may have one gene for normal haemoglobin and one gene for sickle cell haemoglobin. This heterozygous condition is called

A sex linked recessive gene $C$ produces red green colour blindness in humans. A normal woman whose father was colourblind marries a colourblind man. Of all the girls born to these parents what percentage is expected to be colourblind

A colour blind man marries the daughter of a colour blind person. Then in their progeny

Describe pedigree analysis and draw its symbols.