Human DevelopmentVideo

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? 1000
4. How can one person produce so many different combinations of genes?
Meiosis
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 from the tube and cilia
9. Approximately how many sperm are contained within one teaspoon of seminal liquid?
3 hundred million sperm
10. What are some of the challenges that sperm face once entering into the vagina?
Acidity and Mucus
11. Describe the milestone event that takes place two weeks after conception?
Gastrolation. An embryo forms.
12. Describe the size and physical characteristics of the fetus at 4 and 1/2 weeks following conception.
It looks short of like a dinosaur
13. If the DNA in a single cell were stretched out, how long would it be?
6 feet 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?
Months after fertilization
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? The human brain is three to four times bigger than the narrower pelvis