11 Jun Human autosomal recessive traits typically
Question
1. Human autosomal recessive traits typically show which of the following in inheritance patterns…? (choose all that apply)
a. they typically appear with equal frequency in males and females
b. they are less frequent in families with high degrees of cosanguinity (inbreeding)
c. they can skip generations
d. when both parents are carriers, all of their children will express the trait
e. when both parents are affected, only half of their children will express the phenotype
2. Which of the following is NOT a disadvantage when studying human genetics ?
a. Small family sizes
b. Very difficult to establish parent-children relationships (build a genealogical tree)
c. Many of the interesting traits (e.g. diseases) are polygenic
d. Difficult to control environmental conditions
3. Human autosomal dominant traits show which of the following usual characteristics ? (choose all that apply)
a. they do not skip generations
b. when a parent shows the trait, all of his/her children will express the trait as well
c. they typically appear with equal frequency in males and females
d. half of the children of unaffected parents will express the trait
4. Which of the following is an UNREASONABLE concern for a couple to seek genetic counseling?
a. neither of the parents is affected by an autosomal dominant condition, but there are several b. ancestors in both families that had the disease.
c. they are closely related.
d. they are concerned about prenatal exposure to mutagens.
e. one of the parents has a disease that has been described as autosomal dominant.
5. X-linked recessive traits will usually show all of the following, EXCEPT______
a. they will be passed by carrier women and affected men to only half of their daughters.
b. they will be passed by affected women to all of their sons.
c. they will be more common in males than in females.
d. they will be passed by affected men to all of their daughter
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