If both parents are carriers of thalassemia,which is an autosomal recessive disorder,what is the probability of having an affected child?

$A$ normal girl, whose mother is haemophilic, marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offsprings?
$(a)$ Haemophilic son and haemophilic daughter.
$(b)$ Haemophilic son and carrier daughter.
$(c)$ Normal daughter and normal son.
$(d)$ Normal son and normal daughter.
Choose the most appropriate answer from the options given below:

Haemophilia is more commonly seen in human males than in human females because

Select the correct match.

$A$ normal woman,whose father was colorblind,marries a normal man. What will be the status of their sons?

The harmful allele of sickle cell anemia has not been eliminated from the human population. Such afflicted people derive some other benefit. Discuss.