Answer:
A diploid cell with three sets of chromosomes will be as follows in its three different metaphase stages of cell cycle:
1. Metaphase of mitosis: In this event, chromosomes containing sister chromatids are attached to the spindle microtubules raised from both the poles of the cell. The entire sister chromatids will align at metaphase plate, in order to get separated as two chromatids during anaphase.
Metaphase of mitosis
2. Metaphase of meiosis I : In this event, tetrads of chromosomes are aligned on the metaphase plate and each pair of chromatids is attached only to single pole via the spindle microtubule. During this phase, synapsis occurs and crossing over takes place between the two sets of chromosomes.
Metaphase of meiosis I
3. Metaphase of meiosis II: While reaching metaphse II, synapsis completes and crossing over takes place between the two sets of chromosomes. In addition, only half number of the chromosomes will remain, as one cell division has taken place soon after meiosis I. The resulting sister chromatids will align across the metaphase, with their kinetochores being attached to both the oles of the spindle via microtubules. (similar to metaphase of mitosis).
Metaphase of meiosis II
Answer:
Answer:
A drug named aphidicolin inhibits deoxyribonucleic acid synthesis
in eukaryotic cells. It is observed that this drug causes DNA to remain in their G 1 phase, so that DNA replication may stop.
If such type of drug is administered, then several changes takes place in G 1 , S, G 2 , prophase, metaphase, anaphase, or telophase of cell cycle. The changes observed in somatic cells when following types of drugs are administered are as follows:
A drug inhibits microtubule formation- In this case drug will affect G 2 phase of the cell cycle that is it could not complete its prophasE.A drug that allows microtubules to form but prevents them from shortening- In this case metaphase is affected and the cell may possibly not enter anaphasE.A drug that inhibits cytokinesis- In this case, cell could not divide into two daughter cells, that is telophase is affecteD.A drug that prevents chromosomal condensation- In this case cell's G 2 phase is affected and it could not enter prophasE.