Sickle cell anaemia is
An autosomal linked dominant trait
Caused by substitution of glutamic acid by valic acid in the $\beta$-globin chain of haemoglobin
Caused by a change in $3$ base pairs of $DNA$
Characterized by elongated sickle like $RBCs$ with a nucleus
Gene for colourblindness is located on
A colourblind daughter is born when
What is pedigree analysis? Suggest how such an analysis, can be useful.
Carrier of genes of colour blindness are present in
Which one of the following symbols represents mating between relatives in human pedigree analysis?