If mother is a carrier for colour blindness and father is normal, then in the offsprings this disease may be seen in
All the sons
All the daughters
$50\%$ sons and $50\%$ daughters $(carrier)$
All the sons and not in daughters
If a normal women marries a colourblind man
Sickle -cell anaemia has not been eliminated from the African population because it
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 $sons$)
Which one of the following symbols and its representation, used in human pedigree analysis is correct?
Describe pedigree analysis and draw its symbols.