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15 Chapter The Chromosomal Basis of Inheritance Multiple

15 Chapter The Chromosomal Basis of Inheritance Multiple -...

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15 Chapter The Chromosomal Basis of Inheritance Multiple-Choice Questions 1)  Why did the improvement of microscopy techniques in the late 1800s set the stage  for the emergence of modern genetics? A) It revealed new and unanticipated  features of Mendels pea plant varieties. B) It allowed the study of meiosis and  mitosis, revealing parallels between behaviors of genes and chromosomes. C) It  allowed scientists to see the DNA present within chromosomes. D) It led to the  discovery of mitochondria. E) It showed genes functioning to direct the formation of  enzymes. Answer: B Topic: Concept 15.1 Skill: Knowledge/Comprehension 2) When  Thomas Hunt Morgan crossed his red -eyed F1 generation flies to each other, the F  2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed  flies were male. What was the explanation for this result? A) The gene involved is on  the X chromosome. B) The gene involved is on the Y chromosome. C) The gene  involved is on an autosome. D) Other male-specific factors influence eye color in  flies. E) Other female-specific factors influence eye color in flies. Answer: A Topic:  Concept 15.1 Skill: Knowledge/Comprehension 3) Morgan and his colleagues  worked out a set of symbols to represent fly genotypes. Which of the following are  representative? A) AaBb AaBb B) 46, XY or 46, XX C) vg+vgse+se vgvgsese D) +2  +3 Answer: C Topic: Concept 15.1 Skill: Knowledge/Comprehension 4) Sturtevant  provided genetic evidence for the existence of four pairs of chromosomes in  Drosophila in which of these ways? A) There are four major functional classes of  genes in Drosophila. B) Drosophila genes cluster into four distinct groups of linked  genes. C) The overall number of genes in Drosophila is a multiple of four. D) The  entire Drosophila genome has approximately 400 map units. E) Drosophila genes  have, on average, four different alleles. Answer: B Topic: Concept 15.1 Skill:  Knowledge/Comprehension Page 1 5) A man with Klinefelter syndrome (47, XXY) is  expected to have any of the following EXCEPT A) lower sperm count. B) possible  breast enlargement. C) increased testosterone. D) long limbs. E) female body  characteristics. Answer: C Topic: Concept 15.2 Skill: Knowledge/Comprehension 6)  A woman is found to have 47 chromosomes, including 3 X chromosomes. Which of  the following describes her expected phenotype? A) Masculine characteristics such  as facial hair B) Enlarged genital structures C) Excessive emotional instability D)  Normal female E) Sterile female Answer: D Topic: Concept 15.2 Skill: 
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