Recessive characters are expressed
Only when they are present on $X$ chromosomes of male
Only when they are present on $X$ chromosomes of female
On any autosome
On both the chromosomes of female
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
If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased? (In $\%$)
Among symbol $A, B$ and $C, C$ indicates
In the given pedigree, indicate whether the shaded symbols indicate dominant or recessive allele.