GENETICS:

A man and a woman both have brown hair are carriers of the recessive allele for red hair. They plan on having four children together. (1) What is the probability that they have three boys and one girl? (2) What is the probability that they have three boys and one girl and that girl has red hair?

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Elin HesselLv2

16 Mar 2019

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1. A man with normal vision marries a woman with normal vision.Their first child, a boy, is color-blind. i) (one point) Diagramthe cross above.

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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?

22. Mary is not bald. Mary's mother and Mary's husband, John, are bald. John has a non-bald father. Mary is pregnant with a boy/girl dizygotic twin. What is the probability that the twins would develop male pattern baldness in adult life?

	A.	The boy: 100%; the girl: 25%
	B.	The boy: 50%; the girl: zero
	C.	50% for both
	D.	The boy: 75%; the girl: 25%
	E.	The boy: 100%; the girl: 50%
	F.	The boy: 50%; the girl: 25%

25. Mark and Sue both are affected with autosomal recessive blindness, and have 2 normal children. Which of the followings best represent the genotype of this couple, and what is the cause of this event?

	A.	Mark is AAbb, and Sue is AAbb ......de novo mutation
	B.	Mark is aabb, and Sue is aaBB ...... locus heterogeneity
	C.	Mark is aaBB, and Sue is aaBB .......allelic heterogeneity
	D.	Mark is aabb, and Sue is Aabb .....variable expressivity
	E.	Mark is aaBB, and Sue is AAbb........locus heterogeneity