front 1 Sexual reproduction includes a reproductive pattern called _____. | back 1 hermaphroditism |
front 2 Regeneration, the regrowth of lost body parts, normally follows _____. | back 2 fragmentation |
front 3 Asexual reproduction results in offspring that are genetically identical to their parent. What type of cell process occurs to generate this type of offspring? | back 3 mitosis |
front 4 On a submarine expedition to the ocean bottom, you discover a population of fish that are only female. What type of reproduction does this fish most likely use? | back 4 parthenogenesis |
front 5 Genetic mutations in asexually reproducing organisms lead to more evolutionary change than do genetic mutations in sexually reproducing ones because _____. | back 5 asexually reproducing organisms, but not sexually reproducing organisms, pass all mutations on to their offspring |
front 6 Asexual reproduction results in greater reproductive success than does sexual reproduction when _____. | back 6 a species is in stable and favorable environments |
front 7 Sexual reproduction _____. | back 7 can produce diverse phenotypes that may enhance survival of a population in a changing environment |
front 8 Animals utilizing external fertilization are typically _____. | back 8 aquatic animals |
front 9 In close comparisons, external fertilization often yields more offspring than does internal fertilization. However, internal fertilization typically offers the advantage that _____. | back 9 the smaller number of offspring produced often receive a greater amount of parental investment |
front 10 Which of the following correctly traces the path of sperm from their site of production to their exit from a man's body? | back 10 seminiferous tubule → epididymis → vas deferens → urethra |
front 11 Which of the following structures in females is analogous in function to the vas deferens in males? | back 11 oviduct |
front 12 In humans, the follicular cells that remain behind in the ovary following ovulation become _____. | back 12 a steroid-hormone synthesizing structure called the corpus luteum |
front 13 Mature human sperm and ova are similar in that they _____. | back 13 both have the same number of chromosomes |
front 14 Among human males, both semen and urine normally travel along the _____. | back 14 urethra |
front 15 Increasing the temperature of the human scrotum by 2°C (that is, near the normal body core temperature) and holding it there would most likely_____. | back 15 reduce the fertility of the man by impairing spermatogenesis |
front 16 The primary difference between estrous and menstrual cycles is that _____. | back 16 the endometrium shed by the uterus during the estrous cycle is reabsorbed with no extensive fluid flow out of the body, whereas the shed endometrium of menstrual cycles is excreted from the body |
front 17 A primary response by the Leydig cells in the testes to the presence of luteinizing hormone is an increase in the synthesis and secretion of _____. | back 17 testosterone |
front 18 The anatomical location for the typical union of a sperm and an egg (conception) is the _____. | back 18 oviducts |
front 19 Two contraceptive methods that are generally irreversible and which block the gametes from moving to a site where fertilization can occur are _____. | back 19 vasectomy and tubal ligation |
front 20 An ectopic pregnancy occurs when a fertilized egg implants somewhere other than in the lining of the uterus. Usually it implants in the oviduct. Which of the following would be the most likely explanation for such a pregnancy being unsuccessful? | back 20 The lining of the oviduct is unable to support the developing fetus. |
front 21 In male mammals, excretory and reproductive systems share | back 21 the urethra |
front 22 During human gestation, rudiments of all organs develop | back 22 in the first trimester. |
front 23 Salamander and insect populations consisting only of genetically identical females lack males because _____. | back 23 sperm do not fuse with eggs during reproduction, but the eggs develop into embryos anyway |
front 24 In humans, oogenesis in comparison to spermatogenesis is different in that _____. | back 24 oogenesis does not complete meiosis until after fertilization, but spermatogenesis is complete before the sperm leave the body |
front 25 Human sperm cells first arise in the _____. | back 25 seminiferous tubules |
front 26 For which of the following is the number the same in spermatogenesis and oogenesis? | back 26 meiotic divisions required to produce each gamete |
front 27 A fertilized egg usually implants itself and develops in the _____. | back 27 uterus |
front 28 A rapid increase in the _____ level stimulates ovulation. | back 28 luteinizing hormone |
front 29 After ovulation, high levels of _____ inhibit _____ secretion. | back 29 estrogen and progesterone ... FSH and LH |
front 30 Developing ovarian follicles primarily secrete _____. | back 30 estrogens |
front 31 If there is fertilization, secretion of _____ by the early embryo maintains the corpus luteum. | back 31 human chronic gonadotropin |
front 32 If there is no fertilization, degeneration of the corpus luteum results in a drop in _____, which results in the sloughing off of the uterus's endometrium. | back 32 estrogen and progesterone |
front 33 Ovulation usually occurs on or about day _____ of a 28-day ovarian cycle. | back 33 14 |
front 34 What is the usual site of the fertilization of an egg cell? | back 34 oviduct |
front 35 A reproductive hormone that is secreted directly from a structure in the brain is _____. | back 35 gonadotropin-releasing hormone (GnRH) |