A cell has 2n = 12 chromosomes and 2C of DNA in G1…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cell has chromosomes and C of DNA in G1.
- How many chromatids does it have in G2?
- How many chromosomes does the whole cell have in anaphase of mitosis?
- What is its DNA content in anaphase of mitosis, in C?
- How many chromosomes does each daughter cell have after mitosis?
- If the cell divides by meiosis instead, how many chromosomes does each gamete have?
Need a reminder? The key ideaShow
Count the centromeres for the chromosomes and the DNA molecules for the chromatids. The mitotic index is the cells in mitosis divided by all the cells, times . The time of a phase is the share of the cells in it times the length of the cycle. One cell gives cells in cycles, and divisions take place in going from to cells.
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. , C.
Plan. Use the three counting rules of the lesson.
Step 1. G2. chromatids.
Step 2. Anaphase. The chromatids are chromosomes now: chromosomes.
Step 3. DNA at anaphase. No cell has divided yet, so the DNA is C.
Step 4. A daughter cell. chromosomes and C.
Step 5. A gamete. chromosomes, and C of DNA.
Answer: ; ; C; ; .
Check. The two daughter cells hold C, the same as the cell before it divided.
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