1. 280 days OR 40 weeks OR 9 months.
2. Sperm carry a man’s genetic material.
3. The quality of sperm is determined by a man’s health and lifestyle.
4. The smallest cell in a woman’s body is the egg; the largest cell in a woman’s body is the ovum.
5. Two nuclei become one at the moment of fertilization.
6. How many chromosomes come from mom? 23; from dad? 23.
7. Which parent determines the gender of the baby? It comes from the father.
8. Which chromosome determines gender? The Y chromosome.
9. Before it’s called “baby,” it’s called a zygote, then an embryo, and finally a fetus.
10. The placenta is the organ that connects the developing fetus to the uterine wall.
11. Nutrients travel from the mother’s blood to the placenta, then through the umbilical cord to the baby.
12. Humans share how much of their DNA with dogs? About 84%.
13. Only about 1-2% of our genes make us human.
14. During what stage of life does a human head grow proportional to its body? Infancy.
15. During weeks 20 through 30, the most changes occur. And the baby grows 20 times its size in 5 weeks.
16. A baby could be born at 24 weeks and survive.
Parent Tip: Review the logic above to help your child master the concept of in the womb national geographic worksheet.
