In Huntington’s disease, the unaffected persons are homozygous for normal allele $h$. The following is erroneous because
it shows both male and female affected by Huntingtons disease
either person $6$ or $7$ should have the disease, if individual $11$ shows the disease.
at least one of the $2$ children $(8,\,9)$ should have the disease
all of these
If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
Haemophilic female marries normal male, the theoretical ratio of their offsprings regarding haemophilia will be
If a colour blind man marries a woman who is homozygous for normal vision, the probability of their son being colour blind is .........
A woman with two genes for haemophillia and one gene for colourblindness on one of the $X$ chromosomes marries a normal man. How will the progeny be
Colour blindness is caused by a single