What is the probability that their children will have haemophila?

Question

Inheritance: Two Trait Crosses, Incomplete Dominance, Multiple Alleles, And X-Linked Inheritance

A women that is a carrier for haemophilia marries a haemophiliac man. what is the probability that their children will have haemophila?

I am not asking fr anyone to DO my homework, but it is a good wat to check my answers and help me. I am doing Bio 12 thru correspondese and appreciate the help

Answer 1

The disease is carried on the X chromosome and is recessive.

The fact that the father has the disease does not affect the sons -- because the father contributes a Y chromosome to them Since the mother is only a carrier, she has one X chromosome that is good and one that is bad. She has a 50% chance of giving the bad one to her sons -- in which case he is a hemophiliac. She also has a 50% chance of having a son who does not carry the gene at all.

Now the daughters get the father's X chromosome (which is bad). and an X chromosome from the mother. If they get the bad one, they will become hemophiliacs. If they get the good one from their mothers, then they will become carriers. There is a zero percent chance that they will be completely clear.


To recap:

Sons: 50% change of hemophelia -- 50% chance of being clear of it

Daughters: 50% chance of hemophilia -- 50% chance of being a carrier.

Answer 2

Hemophilia is a sex linked recessive trait, so the it is only on the x chromosome. A woman who is a carrier is Xh X. The man is Xh Y. If they have a boy, he will either be Xh Y or X Y, so 1/2 chance of being hemophiliac. A girl will be either Xh Xh or Xh X. So she has a 1/2 chance too. So any child has one half probability of being hemophiliac.

Notice that sex linked ressecive means that :
Xh X is a female carrier, the X with nothing can be written as XH, meaning that is has a dominant H that masks the Xh. Thus the girl is only "carrying" the trait and not expressing it.

XhXh means that you have to ressecive traits, so you will definitely express it.

Y chromosomes don't have the "h" trait. So in males, if there is an Xh, the male will definitely express it. There would be nothing to mask the Xh because the Y cannot be "YH" (no such things).

The only way a male can be normal is if he does not get any defective Xh from mom.

Answer 3

I believe there is a 75% chance their offspring will have Haemophilia. They can only give birth to a Haemophiliac female carrier, as female offspring suffering from the disease will terminate, which leaves male carriers and sufferers.....

Answer 4

For a hemophiliac father and a carrier mother
Sons have a 50% chance of getting hemophilia and a 50% chance of being normal
Daughters will have a 50% chance of being a carrier and a 50% chance of getting full hemophilia

The gene responsible for hemophilia is found on the X chromosome. A father cannot give hemophilia to his sons, as they receive a Y chromosome from him. A son has to inherit the condition from his mother.
Daughters is where a rare situation can occur and things can get dicey with a hemophiliac father and a carrier mother. Daughters are guaranteed to receive a bad X from their dad. Whether they will be carriers or be hemophiliac themselves once again depends upon which X they get from their mom.

Answer 5

Very unlikly unless the mother had it when she was pregant with the baby,then the baby could possibly get it or have it.

Answer 6

And you come from the university of---

Answer 7

25% of females may be haemophilic
25% of females may be carriers
25% of males may be haemophilic
25% of males may be healthy