A beekeeper in Kenya knows that a queen honeybee has 32 chromosomes in her body cells…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A beekeeper in Kenya knows that a queen honeybee has chromosomes in her body cells. Her drones grow from unfertilised eggs and are haploid.
- How many chromosomes does a body cell of a drone have in G1?
- How many chromosomes and chromatids does it have at the end of G2?
- How many chromosomes does the whole cell have in anaphase of mitosis, and how many at each pole?
- Does a haploid cell divide by mitosis? Is the mitosis different?
Need a reminder? The key ideaShow
Cytokinesis cuts the cytoplasm in two. An animal cell forms a furrow from the outside, and a plant cell forms a cell plate from the centre. Each division doubles the number of cells. After divisions of every cell, one cell gives 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.
Step 1. (a) A drone is haploid: chromosomes.
Step 2. (b) chromosomes and chromatids.
Step 3. (c) chromosomes in the whole cell, and at each pole.
Step 4. (d) Yes. The cells of a drone divide by mitosis, and it is the same mitosis. NCERT names the social insects and some lower plants as examples of mitosis in haploid cells.
Answer: (a) ; (b) chromosomes, chromatids; (c) and ; (d) yes, the same process.
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