Fill-in. Comparing spermatogenesis with oogenesis... IN MALES IN FEMALES Approximate number of hours that a gamete remains viable after release (1) (2) Number of ducts that guide gametes through development and exit (3) (4) Approximate number of new gametes that are produced each day in an adult's life (5) (6) Number of chromosomes each gamete carries (7) (8) Number of viable gametes that the completion of meiosis produces (9) (10) When does gametogenesis begin? (11) (12) When does gametogenesis end? (13) (14) 15) Which of these is NOT a common obstacle that reduces the number of sperm that reach the egg? a) Many of the sperm will swim down the wrong fallopian tube. b) Many of the sperm die in the vagina's low pH environment. c) Many of the sperm are anatomically defective. d) Many of the sperm will run out of fuel before reaching the egg. e) Many of the sperm get destroyed by the female's defense cells. f) Many of the sperm will accidently swim past the egg.
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Step 1: (1) IN MALES — Approximate number of hours a gamete remains viable after release: about 72 hours (≈3 days; can survive up to ~5 days in optimal conditions in the female tract). Show more…
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Fill-in. Comparing spermatogenesis with oogenesis... IN MALES IN FEMALES Approximate number of hours that a gamete remains viable after release Number of ducts that guide gametes through development and exit Approximate number of new gametes that are produced each day in an adult's life Number of chromosomes each gamete carries Number of viable gametes that the completion of meiosis produces When does gametogenesis begin? When does gametogenesis end? Which of these is NOT a common obstacle that reduces the number of sperm that reach the egg? a) Many of the sperm will swim down the wrong fallopian tube. b) Many of the sperm die in the vagina's low pH environment. c) Many of the sperm are anatomically defective. d) Many of the sperm will run out of fuel before reaching the egg. e) Many of the sperm get destroyed by the female defense cells. f) Many of the sperm will accidentally swim past the egg.
Madhur L.
Oogenesis and spermatogenesis both result in the formation of gametes. However, these processes are not exactly similar. Determine whether each of the following statements is about spermatogenesis, oogenesis, or both. 1. Results in 4 viable cells. 2. Undergoes meiosis. 3. May or may not finish the full process. 4. Results in hundreds of gametes on a continual basis. 5. After the first meiotic division, the gamete has 23 chromosomes. Ductus deferens Epididymis Interstitial cells Mitosis Seminal vesicle Testes Lobules Seminiferous Spermatogenesis Spermatogonia Meiosis Sustentacular 1. The testes are the male primary sex organs, or gonads. Anatomically, they are divided into lobules, which contain one to four highly convoluted seminiferous tubules. 2. The tubules are the site of sperm production, a process known as spermatogenesis. The stem cells, called spermatogonia, contain 46 chromosomes. 3. At puberty, these cells begin undergoing meiosis, which is a type of cell division that decreases the number of chromosomes and varies the genes found in the gametes. 4. In these tubules are special cells known as sustentacular cells that assist the maturing and dividing spermatocytes. 5. Finally, within the testes but not within the tubules are the interstitial cells, which will provide sex hormones to regulate these processes.
Adi S.
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