1. Name the molecule that carries our genes. DNA
2. Genes are located in the DNA
3. What is the number of sperm the average man produces in a second? 1,000
4. How can one person produce so many different combinations of genes? Miosis
5. Most human cells have a total number of 46 chromosomes.
6. The gene shuffling that occurs from mitosis results in a great amount of this? Diversity
7. Where in the female reproductive tract does the egg wait for fertilization? Fallopian tubes
8. How does the egg move through the Fallopian tube? Muscular contractions and cilia
9. Approximately how many sperm are contained within one teaspoon of seminal liquid? 300 million
10. What are some of the challenges that sperm face once entering into the vagina? Because of acididty, they must escape or die.
11. Describe the milestone event that takes place two weeks after conception? Gasterolation
12. Describe the size and physical characteristics of the fetus at 4 and 1/2 weeks following conception. It's an 1/5 of an inch long, the backbone curves like a tail and the brain is developing and on the side of the face is an eye.
13. If the DNA in a single cell were stretched out, how long would it be? 6 ft. long
14. After about how many weeks can doctors determine the sex of the baby from ultrasound? 18 weeks
15. Aside from the ultrasound, how can a doctor determine the sex of a baby? Chromosomes
16. At what point does the embryo become a fetus? Starting 2 months after being fertilized.
17. When does the placenta begin to form? In the early weeks.
18. What is the fetus’s job in the last trimester? To grow.
19. Why are human births so much more dangerous than other mammals? Because the human brain is 3-4 times bigger and we have a more narrow pelvis.
Monday, April 28, 2008
Human Development Video Questions
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