In a laboratory, a zygote that was formed by IVF divides again and again…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a laboratory, a zygote that was formed by IVF divides again and again. Each division doubles the number of blastomeres.
- How many blastomeres are there after divisions?
- After how many divisions are there blastomeres?
- After how many divisions is the embryo at the largest size for which a transfer into the fallopian tube is made?
- Where is an embryo of blastomeres transferred?
Need a reminder? The key ideaShow
A zygote divides, and the number of blastomeres doubles at each division: after divisions. A zygote or an embryo of up to blastomeres goes into the fallopian tube (ZIFT). An embryo of more than blastomeres goes into the uterus. In GIFT, the ovum of a donor goes into the fallopian tube. If each cycle succeeds with chance , the chance of at least one success in cycles is .
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. The number of blastomeres doubles at each division.
Plan. Use , and use the rule of blastomeres.
Step 1. Six divisions. blastomeres.
Step 2. Sixteen blastomeres. , so divisions.
Step 3. Eight blastomeres. , so divisions.
Step 4. The site. An embryo of more than blastomeres goes into the uterus, so blastomeres go into the uterus.
Answer: ; divisions; divisions; the uterus.
Check. The list of numbers is , and each is double the one before.
Watch out. After divisions there are blastomeres, not . The count doubles, it does not go up by .
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