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? a thousand sperms a second.
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 tube
8. How does the egg move through the Fallopian tube? muscular contractions
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? 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. 1/5 of an inch long, the backbone curves and the brain is developing. the side of the face is a eye
13. If the DNA in a single cell were stretched out, how long would it be? 6 feets
14. After about how many weeks can doctors determine the sex of the baby from ultrasound? 4 or 5
15. Aside from the ultrasound, how can a doctor determine the sex of a baby? if its a y it is a boy and if its a X its a girl
16. At what point does the embryo become a fetus? 2 months
17. When does the placenta begin to form? in early weeks
18. What is the fetus’s job in the last trimester? grow
19. Why are human births so much more dangerous than other mammals? human brain is 3 to 4 times bigger, narrower pelvis
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1 comment:
Well done!
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