ch07_review - Klug, Concepts of Genetics 8/e Chapter 7...

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Klug, Concepts of Genetics 8/e Chapter 7 MEDIA REVIEW QUESTIONS 1. Why do some organisms use both sexual and asexual reproduction? a.The two modes of reproduction maximize the genetic variation within a species. b.The two modes of reproduction are favored under different conditions. c.The organisms are hermaphroditic. d.The organisms are monoecious. 2. The sporophyte stage in plants a.Is linked to the haploid phase via mitosis b.Is diploid and produces diploid spores c.Occurs only within the megaspore mother cell d.Is diploid and produces the male and/or female gametes 3. Which of the following statements about the roundworm C. elegans is false? a.Adults are very simple, consisting of approximately 1000 cells. b.The lineage of every adult cell can be traced back to its embryonic origins. c.No individuals are exclusively female. d.Males have a Y chromosome, and hermaphrodites have an X chromosome. 4. True or false? A human with XXY sex chromosomes is female because she has two X chromosomes. 5. Which of the following statements about XYY males is true? a.They are generally taller than average. b.They have underdeveloped secondary sex characteristics. c.They are likely to end up in prison. d.They are sterile. 6. How does the Y chromosome determine maleness in humans? a.By containing the structural genes for testes production b.By containing a gene coding for the TDF, which directs the development of fetal gonads c.By containing the autosomal genes responsible for the SRY effects d.By containing the genes for steroid metabolism 7. Which of the following statements about individuals with Klinefelter syndrome or Turner syndrome is false? a.Both syndromes result from nondisjunction. b.Both syndromes can be identified by a karyotype. c.Individuals with either syndrome have 44 autosomes d.Individuals with either syndrome are both identified as females. 8. What are pseudoautosomal regions on the sex chromosomes? a.Homologous regions of the X and Y chromosomes b.Hemizygous regions of the X and Y chromosomes c.Homozygous regions of autosomal chromosomes d.Regions of the X and Y chromosomes that don’t recombine during meiosis 9. What is one explanation for the difference between the primary sex ratio and the secondary sex ratio in humans?
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a.More boys die during infancy than girls. b.Women live significantly longer than men. c.Y-bearing sperm are better swimmers than X-bearing sperm. d.There is disproportionate death of female fetuses prior to birth. 10. Which of the following statements about Barr bodies is true? a.They ensure that males and females have equal "doses" of the genes on the X chromosome. b.They are visible only in males. c.They contain no DNA. d. They are inactivated Y chromosomes. 11.
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ch07_review - Klug, Concepts of Genetics 8/e Chapter 7...

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