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Unformatted text preview: chapter 27 True / False Questions 1. Sexual reproduction entails the union of two gonads to form a zygote. True False 2. The presence of the Y chromosome guarantees the development of male secondary sex organs. True False 3. The mechanism that keeps the testes cooler than the body's core temperature is called descent of the testes. True False 4. The scrotum contains the testes and spermatic cords. True False 5. Sperm travels along the ductus deferens before reaching the spermatic cord. True False 6. Sustentacular cells secrete inhibin, which regulates the rate of sperm production. True False 7. Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and libido. True False 8. Erectile dysfunction prevents ejaculation in most cases. True False 9. At early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement of the testes. True False 10. Spermiogenesis is the last stage of meiosis. True False 11. Sperm make up just 10% of semen volume. True False 12. Only germ cells undergo meiosis, which produces four haploid cells with 23 chromosomes each. True False 13. Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing blood to engorge the penis. True False 14. The first haploid stage of spermatogenesis is prophase II. True False 15. Myotonia of skeletal muscles is characteristic of the excitement phase and refractory period. True False Multiple Choice Questions 16. _________ is/are generally accepted as a secondary sex characteristic. A. The enlargement of the breasts B. The presence of testes C. The prostate gland D. The uterus E. The vagina 17. Which of the following are primary sex organs? A. ova B. uterine tubes C. breasts D. ovaries E. scent glands 18. Which of the following is a secondary sex organ? A. testis B. ovary C. vagina D. facial hair E. distribution of body fat 19. Gonads begin to develop A. 2 to 3 weeks after fertilization. B. 5 to 6 weeks after fertilization. C. 8 to 9 weeks after fertilization. D. 20 to 24 weeks after fertilization. E. at birth. 20. _____________ determine/s whether an organism will be genetically male or female. A. Hormonal, genetic and environmental factors B. Prenatal hormone exposure C. The egg D. The sperm E. Both egg and sperm equally 21. The gene that codes for the testis-determining factor (TDF) is found in or on A. the Y chromosome. B. the X chromosome. C. the gonadal ridges. D. the fetal testes. E. the mesonephros. 22. The penis is homologous to A. the appendix. B. a finger. C. the urethra. D. the vagina. E. the clitoris. 23. The _____________ is the gonad and the ___________ is the gamete. A. testis; ovary B. testis; semen C. testis; sperm D. sperm; semen E. semen; sperm 24. ________________ stimulates the descent of the testes. ...
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