8. Which of the following conditions is not recovered in humans? • autosomal tri

Question

8. Which of the following conditions is not recovered in humans?

• autosomal trisomy

• autosomal monosomy

• sex chromosome trisomy

• sex chromosome monosomy

9. Which of the following is true of autosomal trisomy in humans?

• only chromosome 21 can be trisomic

• any autosome can be trisomic, but only 21 survives for very long after birth

• any autosome can be trisomic, and all are about as likely to be viable

• the X is the most likely chromosome to be trisomic

10. Which of the following would be used to describe the result if one chromosome increased in number and the others remained the same?

• automonoploidy

• aneuploidy

• autopolyploidy

• allopolyploidy

11. Which of the following best describes somatic and germ line mutations?

• germ line mutations are passed to the next generation, somatic mutations are not

• somatic mutations are passed to the next generation, germ line mutations are not

• both of these kinds of mutations may be passed equally to the next generation

• germ line mutations are expressed in the generation in which they occur

12. In humans sex is determined by the X and Y chromosomes, so that

• 2 Xs is always female

• all males are XY

• at least 1 Y is male

• less than 2 Xs is male

13. Crossing over between members of homologous pairs occurs during which general stage of meiosis?

• meiosis I

• meiosis II

• both

• neither

14. Which of the following is an example of monosomy?

• XXY

• XY

• XYY

• XO

Explanation / Answer

8. Option A, autosomal trisomy

9 Option B, any autosome can be trisomic, but only 21 survive for long time ahter birth

10. Option B, Aneuploidy

11. Option A, a germ line mutation are passed to the next generation, somatic muation are not

12. Option B, all males are XY

13. Option A, meosis I

14. Option D XO

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