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Genetics

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What percentage of individuals will experience a disease with a genetic component during the course of their lifetime?

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a. 10%

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b. 33%

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c. 66%

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d. 85%

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When correctly reporting a karyotype, where should the sex chromosomes be listed?

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a. First, before the total number of chromosomes

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b. Second, after the total number of chromosomes

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c. Last, after any description of structural abnormalities

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d. None of the above

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Which of the following karyotypes accurately describes a female with a deletion on the long arm of chromosome 17 at band q3?

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a. 46,XY,del(17)(q3)

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b. 46,del(17)(q3)

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c. 46,XX,del(17)(q3)

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d. XX,46,del(17)(q3)

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What is the most common cause of the abnormality depicted in the karyotype below?

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Reproduced with permission from Cunningham FG, Leveno KJ, Bloom SL, et al (eds): Genetics. In Williams Obstetrics, 24th ed. New York, McGraw-Hill, 2014, Figure 13-3.

Graphic Jump Location
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a. Dispermy

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b. Mitotic nondisjunction

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c. Meiotic nondisjunction

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d. Unbalanced translocation

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Trisomy of which of the following autosomal chromosomes is LEAST likely to result in a term pregnancy?

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a. 8

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b. 13

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c. 18

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d. 21

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Which of the following generalizations is true regarding the reproductive capacity of adults with Down syndrome?

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a. Both males and females are sterile.

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b. Both males and females are fertile.

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c. Males are fertile, and females are sterile.

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d. Males are sterile, and females are fertile.

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