Step-by-Step Solution
The different stages in the life cycle of the plant Haplopappus gracilis [2n = 4] of genotype A/a; B/b are shown. The plant has one long and one short pair of chromosomes. The Stage -1, 6, 7, 8, 9 11 and 12 are impossible conditions. Usually, in meiosis-I homologous chromosomes separate, whereas in meiosis-II sister chromatids separate.
In Stage-1 and 12, the alleles of the same genes are on non-homologous chromosomes and they should be present on homologous chromosomes. On Stage -6, the stage appears to be anaphase of mitosis, but the alleles of sister chromatids are not identical. Stage -7, 8 and 9 have too many chromosomes instead of 4. Stage -11, It appears to be the meiosis of homozygote a/a; B/B. this does not match the given genotype.
The Stage -2, 3 and 4 are in Meiosis II. In these stages, the separation of homologous chromosomes by spindle fibers is done by aligning them along the equator. The stage-10 is in Meiosis I and the Stage-5 is in mitosis. Therefore,
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