What are the chances of a couple, heterozygous for the gene coding for albinism to have a fifth albino child?

Q. Albinism in human is controlled by a recessive gene 'a'. If both parents were known to be carriers (Aa) for albinism, what are the chances of 1 normal and 3 albinoes in a family of four?

Q. Albinism, lack of pigmentation in humans, results from an autosomal recessive gene designated 'a'. Parents with normal pigmentation have an albino child. What is the possibility that their next child be albino? What is the possibility that the next child will be an albino girl?

Q. Albinism is known to occur due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino?

Q. Albinism is determined by a recessive gene in man. The presence of albinism in 50% children born to a couple proves that