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- 9.1 Label structures A, B andC. (3) 9.2 State THREE functions of D. (3) Fertilisation usually takes place at Y. Why will a blockage at X: (a) Prevent fertilisation at YND 9.3 (1) (b) Not necessarily lead to infertility (2) (9) QUESTION 1012.Place the following events of the acrosomal reaction in the correct chronological order.(This is a multiple choice question choose the answer from the choices below) choose the best answer. Thank you! (1) The acrosome releases hydrolytic enzymes. (2) Sperm-binding proteins on the membrane bind the sperm. (3) Sperm nucleus enters the egg. (4) Sperm and egg plasma membranes fuse. (5) Sperm contacts the egg's jelly coat A.1,2,4,3,5 B.3,5,2,1,4 C.5,1,2,4,312.Place the following events of the acrosomal reaction in the correct chronological order. (1) The acrosome releases hydrolytic enzymes. (2) Sperm-binding proteins on the membrane bind the sperm. (3) Sperm nucleus enters the egg. (4) Sperm and egg plasma membranes fuse. (5) Sperm contacts the egg's jelly coat (This is a multiple choice question choose the answer from the choices below) A.1,2,4,3,5 B.3,5,2,1,4 C.5,2,4,3,1 D.5,1,2,4,3
- Movement of spermatozoa through this component of the male reproductive pathway (6) occurs during the same phase of sexual activity as which of the following? (A) nitric oxide release (B) movement of sperm through the epididymis (from the head to the tail) (C) release of prostatic secretions (D) movement of sperm through the penile urethra (E) A and B (F) B and C (G) C and D (H) B, C, and D1. What is the greatest in terms of number? a.) Length of the membranous urethra (in inches) b.) No. of chromosomes in spermatid c.) No. of sperm produced from 1 spermatid d.) No. of seminiferous tubules in single testis e. No. of sperm produced from single spermatogonium 2. Which processes is controlled by sodium balance? a.) Glomerular filtration rate & sodium reabsorption b.) Glomerular filtration rate & renin production c.) Sodium reabsorption and potassium secretion d.) All of the above e.) None of the above11. A) Why do we generally see animals with eggs and sperm for gametes (i.e., why do we have two sexes)? B) Why is the sex ratio usually 1 to 1 (use an ESS argument in your answer)?
- Reproductive physiology (human) a) At the time of ovulation, the released ovum (egg) has completed both meiosis I and meiosis II. b) Because the corpus luteum (CL) is rescued from atresia by hCG early in pregnancy, the CL continues to produce progesterone throughout the 9 months of a normal pregnancy. c) Late in the follicular phase, estrogen participates in a positive feedback loop that leads to a surge in luteinizing hormone and ovulation. d) Both (a) and (b) are correct and (c) is incorrect e) Statements (a), (b) and (c) are all correctIn human spermatogenesis, mitosis of a stem cell gives rise to one cell that remains a stem cell and one cell that becomes a spermatogonium. (a) Draw four rounds of mitosis for a stem cell, and label the daughter cells. (b) For one spermatogonium, draw the cells it would produce from one round of mitosis followed by meiosis. Label the cells, and label mitosis and meiosis. (c) Explain what would happen if stem cells divided like spermatogonia.Identify the cell marked (1) in this diagram of spermatogenesis (A) secondary spermatocyte (B) primary spermatocyte (C) spermatogonium (D) spermatozoan
- 2. 5. 10 4. Identify the sequence of structures through which sperm pass from the site of production to the vagina.Identify the cell in the list below which is the first haploid cell formed (A) spermatogonium (B) primary spermatocyte (C) secondary spermatocyte (D) spermatidIn vertebrate animals, spermatogenesis and oogenesis differ, in that 1.) Cytokinesis is unequal in oogenesis whereas it i equal in spermatogenesis 2.) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born 3.) Oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon 4.) Oogensis ends at menopause. Whereas spermatogenesis is finished before birth 5.) Oogensis begins at the onset of sexual maturity whereas spermatogenesis happens in embryonic development