Human Growth and Development (DEP 2000)
Prof. Rabulan, Doral College
Unit 1: Prenatal Development and Newborn Infants
Name: Jenna Cordero
Date: ___________________
Life’s Greatest Miracle (PBS Nova)
Video Comprehension Questions
1. How many human babies are born each day?
• 365,000
2. How many cells are there in the human body?
• 100 trillion cells
3. What does the video say is the "fundamental urge" for all life?
• To reproduce
4. What is DNA "very good" at?
• Making copies of itself
5. How does the DNA of a bacterium compare to its parent's?
• Exact replicas
6.
What risk is there for a species that only reproduces by cloning?
• All members of the population would have the same immune system, so if the person cloning has a
weak immune system, one parasite could wipe us all out
7. How does the DNA of sexually produced offspring compare to the DNA of the parents?
• Combination of mother and father
8. How many sperm does the average human male produce each second?
• 1000
9. What process creates sperm cells and egg cells?
• meiosis
10. How many chromosomes are there in a normal human body cell?
• 46
Human Growth and Development (DEP 2000)
Prof. Rabulan, Doral College
Unit 1: Prenatal Development and Newborn Infants
11. What happens to the genes when two chromosomes "embrace"?
•
They exchange DNA
12. What is the advantage of diversity within a species?
• Higher chances of survival of a new generation
13. When does a human female produce her eggs?
• When she is a fetus in her mother’s womb
14. How many eggs does the average human female release per month?
• 1
15. What is an egg missing that it needs to survive?
• DNA from sperm
16. About how many sperm are released into the vagina?
• 300 million
17. What danger confronts sperm in the vagina?
• Acidity of the vagina
18. What does the sperm need in order to move through the egg’s zona?
• Proteins from the sperm must hook up with the egg’s surface.
19. How much time passes between fertilization and the first division of the zygote?
• 24 hours
20. What happens if the dividing zygote accidentally separates into two?
• Creates two embryos, twins
21. After fertilization, how long does it take the blastocyst to arrive in the uterus?
• 5 days
Human Growth and Development (DEP 2000)
Prof. Rabulan, Doral College
Unit 1: Prenatal Development and Newborn Infants
22. What risk does the blastocyst face after it attaches to the uterus?
• Could be attacked by the mother’s immune system
23. What is gastrulation?
• Cells organize into an embryo deep within the uterine lining
24. What will the lower layer of cells develop into?
• Lungs, liver, and the lining of digestive track
25. What will the middle layer of cells develop into?
• Heart, muscles, brain, and blood
26. What will the outer layer of cells develop into?
• Spinal cord, brain, skin, and hair
27. How long is the embryo after 4 ½ weeks?
• 1/5 of an inch
28. True or false: All cells have the same genes.
• true
29. What does a gene do when it has been “turned on?”
• Produce proteins
30. What do the following proteins do?
a. collagen: fiber that makes up much of your skin, tendons and bones
b. crystallin: helps make the lens of your eye clear
c. actin and myosin: move muscle fiber
d. hemoglobin: carries oxygen from lungs to the rest of the body
31. How do cells communicate with each other?
Human Growth and Development (DEP 2000)
Prof. Rabulan, Doral College
•
Unit 1: Prenatal Development and Newborn Infants
Chemical messages
32. How is the Y chromosome different from the X chromosome?
• The Y chromosome is one-third the size of the X chromosome and contains about 55 genes while the
X chromosome has about 900 genes
33. From where does the baby get its nutrients?
• The mother’s blood
34. Do the baby's and mother's blood ever mix?
• No
35. How old is the fetus when it gains the ability to hear sound?
• 5 months
36. What is the main job of the fetus during the last trimester?
• To grow
37. What does myelin do?
• Wraps around the long connections of brain cells, helps nerves move faster, enhances brain power.
38. Why is birth more dangerous for humans than for other animals?
• The human brain is bigger than the human pelvis so sometimes there’s not enough room for