Which of the following is a sex-linked character
Baldness
Polio
Colourblindness
Heart disease
Haemophillic man marries a normal woman. Their offsprings will be
All sons of a couple are colourblind because
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.
Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans.
The trait traced in the above pedigree chart is
Describe pedigree analysis and draw its symbols.