Human Development Video

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 (6) 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.