Exercise 43

CHAPTER 431) 1. C 7. B 2. B 8. A 3. A 9. B 4. B 10. C 5. C 11. B 6. A 12. B2) Describe the process of synapsis The pairing of homologous chromosomes (23 tetrads croak attached to spindle fibers & begin to align on the equator.3) How does crossover lay in variability in the daughter cells? The homologues separate from one another, breaking & exchanging parts- where crossovers happen4) Define homologous chromosomes Egg & sperm cell chromosomes that carry genes for the same traits (1 paternal, 1 maternal)5) 1. Primitive stemspermatogonium 2.Haploidsecondary spermatocyte, spermatid, sperm 3. Provides nutritiouss to exploitation spermsustentacular cells 4. Products of light reflex IIspermatid 5. Product of spermiogenesissperm 6. Product of meiosis Ispermatocyte6) Why are spermatids not considered functional gametes? They are non-motile and have in like manner much exorbitance baggage to function well in a reproductive capacity.7) Differentiate between spermatogenesis and spermioge nesis Spermiogenesis is the final stage of spermatogenesis, which sees the maturation of spermatids into mature, unsettled spermatozoa. Formation of haploid gametes by male sloughing off excess spermatid cytoplasm to form a functioning sperm8) Draw a sperm, label acrosome, head, mid piece and tail. Beside from each one label, note the typography, and function of each sperm body structures. Acrosome ( composition & function) penetrating device containing digestive enzymes Head ( composition & function) genetic region, nucleus Mid piece ( composition & function) contains mitochondria which succeed adenosine triphosphate Tail ( composition & function) contractile filaments (loco motor region)9) The lifespan of a sperm is very short?What anatomical characteristics might lead you to suspect this compensate if you dont know its life span? No cytoplasm in which to retention nutrients10) The sequence of events leading to germ cell formation in the young-bearing(prenominal) begins dur ing fetal development, by the time the child is born all workable oogonia have been converted to Primary oocytes How does the total germ cell authorization of the female compare to that of the male? Much smaller, and the total number is determine11) Female gametes develop n structures called follicles. What is a follicle?A saclike structure containing follicle cells in one or more layers that enclose a developing gamete. How are radical and vesicular follicles anatomically different? Primary follicle=primary oocyte a single layer of cuboidal/columnar follicle cells Secondary follicle=several(prenominal) layers of cuboidal/columnar cells collectively called the membranous granulose which secrete follicular fluid What is a corpus luteum? It is whats left of the follicle after a adult female ovulates, glandular ovarian structure that produces progesterone.The ruptured vesicular follicle is converted to corpus leuteum.12) What is the study hormone produced by the vesicular follicle ? Estrogen What is the major hormone produced by the corpus luteum? Progesterone (and some estrogen)13) 1. B 2. C 3. C 4. D14) The cellular product of spermatogenesis is four _____________ the final product of oogenesis is one ________ and 3 ____________ Spermatids, ovum, polar bodies. What is the function of the unequal result of oogenesis in the female?To provide the ovum or functional gamete w/adequate nutritional militia so that it can survive its journey to the uterus. What is the fate of the 3 piffling cells produced during oogenesis? Why? They will deteriorate they lack sustaining cytoplasm w/nutrient reserves.15) 1. FSH 2. LH 3. Estrogen and Progesterone 4. Estrogen 5. LH 6. LH16) Why does the corpus luteum deteriorate toward the end of the ovarian cycle? Because race levels of the anterior pituitary hormone LH are very beginning17) 1. B 2. A 3. B 4. B 5. A18) What uterine create from raw stuff undergoes dramatic changes during the menstrual cycle? Endometrium19) When during the female menstrual cycle would dressing be unlikely? Explain why? Anytime but the three-day interval (days 14-16) roughly ovulation (28 day cycle assumed)20) Assume that a woman could be an on demand ovulator like the rabbit, in which copulation stimulates the hypothalamic-anterior pituitary axis and causes LH release, and an oocyte was ovulated and fertilized on day 26 of her 28-day cycle.Why would a successful pregnancy be unlikely at this time? The uterine lining goes through a cycle of building up every cycle to meet an fertilized egg. By the time day 26 comes along, the lining is getting diligent to slough off during the next period. Most likely the lining of the uterus would not be able to support the implantation and development of the embryo at this time.