A man and a woman, both carriers of the sickle cell allele (Hb^S), have five children. The first two children are unaffected, the third child has sickle cell anemia, and the fourth and fifth children are unaffected. What is the probability that a phenotypically normal sixth child will be a carrier? (the answer is 2/3 and I dont know why, someone please explain)

1/3

1/4

3/4

1/2

2/3

answer

watching

536

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Trinidad TremblayLv2

6 May 2019

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Related questions

Sickle cell anemia and albinism are both recessive traits inhumans. Imagine that a couple, already pregnant with twins, hasjust learned that they are both heterozygous for both of thesetraits. As the couple's genetic counselor, the couple asks you thefollowing questions about how their carrier status will affecttheir offspring.

If the couple has fraternal twins, what is the probability thatboth children will be unaffected by both conditions?

If the couple has fraternal twins, what is the probability thatboth of the couple's children will have both sickle cell anemia andalbinism?

3.What is the probability that one of the fraternal twins is acarrier of either, but not both, of the conditions?
(Hint: You will need to use both the product law and the sum law toanswer this question.)

If the couple has fraternal twins, what is the probability ofhaving two phenotypically normal children, one being a carrier ofonly the sickle cell anemia recessive allele, and the other being acarrier of only the recessive allele for albinism?
(Hint: You will need to use both the product law and the sum law toanswer this question.)

raspberrysnail175

Two parents who do not have sickle cell anemia have a child that has the disease. The parents are both:

1.) Pleiotropic for the sickle cell allele

2.) Homozygous for the sickle cell allele

3.) Homozygous for the normal allele

4.) Heterozygous for the sickle cell allele

5.) Epistatic for the sickle cell allele

1. Hemophilia is a sex-linked recessive disorder. List all the unique female genotypes for hemophilia.

2. Hemophilia is a sex-linked recessive disorder. List all the possible genotypes of someone unaffected with hemophilia.

3. Hemophilia is a sex-linked recessive disorder. If an unaffected woman mates with an unaffected man, and they have 2 children with hemophilia, and 2 children who are unaffected. What are the chances that the couple will have a child without hemophilia?

4. Hemophilia is a sex-linked recessive disorder. If an unaffected woman mates with an unaffected man, and they have 2 children with hemophilia, and 2 children who are unaffected. What are the chances that the couple will have a boy who has hemophilia?

5. Hemophilia is a sex-linked recessive disorder. If an unaffected woman mates with an unaffected man, and they have 2 children with hemophilia, and 2 children who are unaffected, What are the chances that the couple will have a girl who does not have hemophilia?