If both parents are carriers for thalassaemia,which is an autosomal recessive disorder,what are the chances of pregnancy resulting in an affected child?

Which disorder is related to the quantitative amount of hemoglobin?

Sickle cell anaemia is caused due to the substitution of

If a color-blind woman marries a normal man,what will be the phenotype of their children?

$A$ man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind (in $\%$)?

$A$ normal woman whose father was colourblind marries a normal man. What kinds of children would be expected and in what proportion?