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3.5.4.2. Hemophilia (problems solved)

Genetics problem 147

Hemophilia is determined by an X-linked recessive gene. 

How can they be the descendants of a normal man (XHY) and a carrier woman (XHXh)?

Genetics problem 148

A non-hemophilic woman, whose father was, was paired with a non-hemophilic man.

a) What is the probability that they will have a hemophilic male child?

b) What is the probability that they will have a hemophilic daughter?

c) What is the genotype of the offspring?

d) How is this disease transmitted?

Genetics problem 149

a) What will the male children of a normal woman with hemophilia and a hemophiliac man be like? 

b) What is the probability that they will have a daughter who is a carrier of hemophilia?

Genetics problem 150

A recessive sex-linked gene determines hemophilia in the human species. A non-hemophilic woman, whose father was, is paired with a non-hemophilic man.

a) What is the probability that she will have a hemophilic male child?
b) What is the probability that he has a hemophilic daughter?

Genetics problem 151

The hemophilia gene (Xh) is recessive with respect to the normal gene (XH). List the genotype and phenotype of possible offspring between a female carrier and a non-hemophilic male. What proportion of male children will be hemophiliacs? Reason the answers representing the diagrams of the possible crosses.

               

Genetics problem 152

The offspring of a couple is made up only of hemophilia-bearing women and healthy men. Indicates the genotype and phenotype of both parents. Reason the answers representing the diagrams of the possible crosses.

Genetics problem 153

Hemophilia is an inherited disease that causes blood clotting problems A woman who does not have hemophilia, whose father did, is paired  with a non-hemophiliac man.

a) What can be the genotype of the offspring of this couple? Justify and reason your answer.
b) What is the probability that this couple will have a hemophilic male child? Justify and reason your answer.
c) What is the probability that this couple has a hemophilic daughter? Justify and reason your answer.
d) To which chromosome is the transmission of hemophilia linked?

Genetics problem 154

Hemophilia is a disease caused by an X-linked recessive gene that causes blood clotting problems. A couple has a son and a daughter, but the son is the only one in the whole family who has hemophilia.

a) What is the genotype of the parents?

b) What genotypes can the daughter present?

c) What is the probability that another hemophiliac child would be born?