A zygote has a volume of 1000 pL. It divides without growing, and all the cells divide together…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A zygote has a volume of pL. It divides without growing, and all the cells divide together.
- How many cells are there after divisions?
- How many cells are there after divisions?
- What is the volume of one cell after divisions?
Need a reminder? The key ideaShow
Fertilisation takes place in the ampulla and gives a zygote with chromosomes. Cleavage gives cells after divisions, with no growth of the embryo. The morula has to cells. The blastocyst has a trophoblast and an inner cell mass. The ovum always carries X, and a sperm carries X or Y with equal chance. The trophoblast attaches to the endometrium in implantation.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Zygote: pL. No growth.
Plan. The number of cells is after divisions. Divide the volume by the number of cells.
Step 1. After 4 divisions. cells.
Step 2. After 5 divisions. cells.
Step 3. One cell after 5 divisions. .
Answer: cells; cells; pL.
Check. pL, the volume of the zygote.
Discussion (0)
Log in to join the discussion.
Loading…