1 A) about 200 thousand B) about 200 million C) about 200 billion D) an unknown quantity 2 A) seminiferous tubules; ovaries; epididymis; fallopian tubes B) vas deferens; seminiferous tubules; testes; penis C) seminiferous tubules; testes; epididymis; vas deferens D) epididymis; ovaries; vas deferens; testes 3 A) cervix B) uterine tube C) ovaries D) placenta 4 A) monoploid B) haploid C) diploid D) triploid 5 A) 2 B) 4 C) 8 D) 16 6 A) 2 B) 4 C) 8 D) 16 7 A) crossing over B) independent assortment C) random alignment of chromosomes at metaphase D) all of the above 8 A) Yes, sister chromatids are always identical structures. B) No, sister chromatids belong to different chromosomes and may be different from each other. C) No, crossing over could generate differences. D) Maybe, it varies from cell division to cell division. 9 A) interphase B) prophase I of meiosis I C) prophase II of meiosis II D) metaphase I of meiosis I 10 A) a female will always produce four polar bodies B) the first polar body is diploid, while the others are haploid C) meiosis will be completed only if fertilization occurs D) several primary oocytes will complete meiosis I each cycle 11 A) interphase B) prophase I of meiosis C) prophase II of meiosis D) telophase I of meiosis 12 A) 2; 1 B) 2; 2 C) 1; 2 D) 1; 1 13 A) In females, most of the cytoplasm is concentrated in one huge cell. B) In males, one primary spermatocyte divides to yield two equal-sized secondary spermatocytes. C) In males, one secondary spermatocyte divides to yield two equal-sized spermatids. D) Oogenesis is completed prior to birth. 14 A) prior to birth B) monthly after puberty C) upon ovulation D) upon fertilization 15 A) the blastomere B) the morula C) trophoblast cells D) the sperm 16 A) the first week B) the seventh week C) the ninth week D) the twenty-second week 17 A) morula B) gastrula C) blastomere D) trophoblast 18 A) yolk sac B) allantois C) chorionic villi D) trophoblast 19 A) notochord B) primitive streak C) allantois D) neural tube 20 A) endoderm B) ectoderm C) mesoderm D) inner cell mass 21 A) endoderm B) ectoderm C) mesoderm D) inner cell mass 22 A) an embryonic cell B) a fetal cell C) a somatic cell D) an artificial cell 23 A) monozygotic twins B) dizygotic twins C) spermatozoa D) all of the above 24 A) transformers B) carcinogens C) alterations D) teratogens 25 A) lithium B) diethylstilbestrol C) penicillamine D) thalidomide 26 A) second trimester B) third trimester C) embryonic period D) entire pregnancy 27 A) phocomelia B) pattern baldness C) segmental progeroid syndromes D) rubella 28 n ), signifying that they have two copies of the genome.A) gametes B) haploid C) diploid D) gonads 29 A) Mitosis B) Cytokinesis C) Meiosis D) Cloning 30 A) homologous chromosomes B) sister chromatids C) spindle fibers D) nuclei 31 A) mitosis B) meiosis 32 A) amniotic cavity B) gastrula C) acrosome D) placenta
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