help with this and why for each 15 gracilisis diploid and 2n-4. There are one lo

Question

help with this and why for each

15 gracilisis diploid and 2n-4. There are one long pair and one short pair of panying diagrams (see page 113) represent anaphases ("pulling apart" S. The plant Haplopappu chromosomes. The accom stages) of individual cells in meiosis or mitosis in a plant that is genetically a dihy genes on different chromosomes. The lines represent chromosomes or chroma of the V's represent centromeres. In each case, indicate if the diagram represents a cell in mei meiosis II, or mitosis. If a diagram shows an impossible situation, say so tids, and the points iosis I, 10 at 12

Explanation / Answer

given that 2n=4, therefore during anaphase of mitosis, all the chromatids of 4 chromosomes go to each pole. While at anaphase1 of meiosis1, 4 chromosomes becomes halved means 2 chromosomes at each pole. And at anaphase2 of meiosis2, chromatids of 2 chromosomes go to each pole.

therefore, in figure 1-4, 2 chromosomes are getting seaparated, which is result at anaphase2 of meiosis2. In figure 5-6, 4 chromosomes got separated and each chromatids going to each pole, indicates the anaphase stage of mitosis.

Now, in fig- 7-9 is not possible in normal cell division, because there are total 8 chromosomes shown in this figure, but there are total 4 chromosome in a cell. Hence, it is not possible.

In fig 10-12, 2 chromosomes are going to each pole, which happens only at anaphase1 of meiosis1. Chromosomes

number are getting halved.

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