The diploid number of many Allium (onion) species is 16. Use this number and you

Question

The diploid number of many Allium (onion) species is 16. Use this number and your knowledge of the cell cycle to complete Table 1 for a single Allium cell during each of the mitotic phases listed at left. Note that the mass of DNA in the G1 cell is hypothetical. Table 1: Chromosome Numbers in Allium Cell Cycle Phases Which cellular activity has the opposite affect on chromosome condition as the separation of sister chromatids during anaphase? The centrosome is usually duplicated during S phase. If this duplication were to fail, then how should mitosis be affected?

Explanation / Answer

7. The number of chromosomes will be 8 in G1, 16 in S, G2 and after cytokinesis. The mass of DNA will be 400 ng in S and G2 phase. While it will be equally divided into daughter cells after cytokinesis.

8. The cellular activity that has opposite effect on chromosome condition will be telophase where chromosomes diffuse and reformation of nuclear membrane takes place.

9. There will be mitotic block if centrosomes are not duplicated during S phase.

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