1 Biology, 8e (Campbell) Chapter 15 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 Mendel's 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 F 1 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.
2 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 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: Application/Analysis 7) Males are more often affected by sex-linked traits than females because A) males are hemizygous for the X chromosome.
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