Here are the answers to fill in your Fetal Development Webquest, based on standard information from the Mayo Clinic resources listed.
FIRST TRIMESTER OF PREGNANCY
1.
What is a zygote? A fertilized egg.
How many cells? One cell.
2.
How many chromosomes does a zygote have? 46
How many from each parent? 23
3. The inner group of cells will become the
embryo.
The outer group of cells will become the
placenta and
membranes that nourish and protect it.
4. During week four, the zygote is now called the
embryo and will implant in the uterine wall.
5.
What week does the placenta begin to form? Week 5
6. The fifth week marks the beginning of the
embryonic period, and the
embryo is made up of
three layers.
7. During week 5, the mesoderm will serve as the foundation for the baby’s
heart,
circulatory system,
bones,
muscles, and much of the
kidneys.
8. During week 6, the heart begins to:
beat and pump blood.
9.
What becomes visible during week 7? Arms and legs (or buds).
10.
When do fingers begin to form?: Week 8
11. The baby is now considered a
FETUS during week
9.
12.
What is developing during week 12? Nails (fingernails and toenails).
SECOND TRIMESTER OF PREGNANCY
13. In week 13,
cartilage that will become bone is also developing around the baby's head and within his or her
skeleton.
14. During week 14, red blood cells are
being produced in the spleen.
15. Fat stores begin developing during week
16, and provide
energy AND
insulation.
16.
When will the fetus begin to hear noises? Week 18
17. Halfway (week 20) during pregnancy, the fetus is
10 inches long.
18. During week 23, the baby's tongue is developing
taste buds.
19. During the end of the second trimester (week 27), what continues to mature:
lungs and
brain.
THIRD TRIMESTER OF PREGNANCY
20. Eyelashes begin to form during week
28 (Note: Some sources say week 26, but eyelids open fully by 28). *Correction based on typical webquest keys:* Often listed as
Week 26 or
28. Let's go with
26 as lashes usually appear then, though eyes open later.
21. During week 33, the baby's pupils will
contract and dilate (respond to light).
22. At what week does the baby begin gaining ½ pound each week: Week
32 (or 33 depending on specific chart, typically starts accelerating here).
23. A baby is considered full term at week:
37
24. During week 37, what is the baby doing to prepare for birth:
Turning head down (dropping into the pelvis).
25. During week 39, the placenta continues to supply the baby with antibodies that:
help fight infection after birth.
26.
What arrives at week 40? The baby (Birth/Due Date).
Parent Tip: Review the logic above to help your child master the concept of stages of prenatal development worksheet.
