When in a man’s lifetime are sperm produced?

When in a man’s lifetime are sperm produced?

BIO 102 Lab 06: Human Reproduction

To submit, watch the video, “Life’s Greatest Miracle”, answer the questions, & upload your document to Canvas.

Watch the video here: https://www.youtube.com/watch?v=cbTAg5MUcnE and answer the questions below. Please use a different colored font for your answers. Save the completed assignment as a .docx or .pdf file and submit it through Canvas.

*Pro-Tip: Print out the questions, read them in advance of starting the video, and watch the video at a faster playback speed to save time.


Chapter 1: Passing on your DNA


1. How many cells are present in your body?


2. What is a clone? What is the problem (biologically speaking, not ethically) with cloning as a method of reproduction?


3. How long are the seminiferous tubules in men? (The video calls them “tubules coiled into bundles”.)


4. How many sperm are produced per second? Per day? During a typical man’s lifetime?


Chapter 2: The Egg’s Journey


5. When in a man’s lifetime are sperm produced?


6. When in a woman’s lifetime are eggs created?


7. How many eggs are initially produced; approximately how many eggs does Melinda still have at the age of 31?


8. How are eggs propelled through the Fallopian tube to the uterus?


9. The video states that an egg will survive only a few hours if not fertilized. More recent information suggests that an egg will survive at least 24 hours and perhaps as long as 48 hours if not fertilized. How does that fact influence the most fertile time when couples are attempting to avoid pregnancy using the rhythm method?


10. What direct biological process in the male results in the erection of the penis?


11. How much liquid and how many sperm are released at ejaculation?


Chapter 3: The Sperm’s Journey


12. In what way is the environment of the vagina dangerous to sperm?


13. What kinds of defects are seen in sperm?


14. What role does the mucus plug in the cervix usually play? How does the mucus change to allow sperm to enter the uterus?


15. Where in the female reproductive tract does fertilization of the egg occur?


16. Why are the first sperm arriving not the most likely to fertilize the egg?



Chapter 4: The First Two Weeks


17. What percentage of fertilized eggs are estimated to fail to develop?


18. How do identical twins form?


19. How does the blastocyst prevent the mother’s immune system from destroying the developing embryo?


Chapter 5: The Embryo Takes Shape


20. What is the size of the embryo at five weeks?


21. Your cells all contain the same DNA, but why do different cells look and behave differently?



Chapter 6: Messages in the Genes


22. Where is the SRY gene found? What does it do? When does it function?


23. How do fingers (and toes) become separated from each other in the developing fetus?



Chapter 7Feeding the Growing Fetus


24. What is a placenta? What is the function of its villi?


25. Do maternal and fetal blood mix?



Chapter 8: The Third Trimester


26. Explain the importance of fat to the growing fetus. What is the fat used for?


27. Write a paragraph summarizing highlights of what you have learned from this movie, here:



BIO 102 Lab 07: Human Reproduction 1

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