MediumBiologyHigh School (11–12)Diversity of Living Organisms › Plant Life Cycles and Alternation of GenerationsDiversity of Living Organisms › Gymnosperms and AngiospermsNumericalNEETBoard Exam
A Chlamydomonas zygote divides by meiosis…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A Chlamydomonas zygote divides by meiosis. Each cell it makes then divides by mitosis times in a row. How many cells are there at the end, and are they haploid or diploid?
Need a reminder? The key ideaShow
The gametophyte () makes gametes; the sporophyte () makes spores by meiosis. Haplontic: the gametophyte is the main plant and the zygote is the only diploid cell (Spirogyra, Volvox). Diplontic: the sporophyte is the main plant (seed plants, Fucus). Haplo-diplontic: both are many-celled (bryophytes with the gametophyte main, pteridophytes with the sporophyte main).
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.
Step 1. Meiosis. One diploid zygote gives haploid cells.
Step 2. Mitosis. Three rounds double the number three times: .
Step 3. Ploidy. Mitosis keeps the chromosome number, so all cells stay haploid.
Answer: cells, all haploid ().
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