Biology, 14.10.2019 12:30 dollazant2

Describe what is happening in each stage and what each stage looks like: prophase prometaphase metaphase anaphase telophase cytokinesis

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Prophase is the first phase is when the two sister chromatids pair up and the nucleoli disappears. Prometaphase is the second phase where the microtubules begin to separate from each other, each pair of microtubules attach to the kinetochores and some nonkinetohore microtubules interact with those from the opposite pole of the spindle. Metaphase is the third phase where the chromosomes are lined up on the invisible line of the metaphase plate. Anaphase is the fourth phase where the two daughter chromosomes begin to separate from each other to opposite poles. Telophase is the last phase where the two daughter nuclei form creating two identical nuclei.

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M-phase is the shortest phase of the cell division which lasts for about 1 hour. During M-phase cell separates its genetic material followed by cell division. For this phase proceeds in two stages:

1. Karyokinesis: during which nuclear division takes place. Karyokinesis further divides into four stages mainly :

i. Early-prophase- condensation of chromosomes, formation of mitotic spindle and nucleolus where ribosomes are made disappears.

ii. Pro-metaphase- late prophase in which chromosomes finish condensing, nuclear envelope breaks down, mitotic spindle grows more.

iii. Metaphase- chromosomes aligned at the center of the cell, highly condensed form of chromosomes is seen and kinetochores attached to microtubules from opposite spindle poles.

iv. Anaphase-separation of sister chromatids due to breakdown of cohesin protein.

v. Telophase- chromosomes begin to decondense, establishment of mitotic spindle is broken down.

2. Cytokinesis: during which cellular division takes place. Cytoplasm divides to form two new cells and we end up with two new cells.

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where is the scientific experiment?

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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

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Describe what is happening in each stage and what each stage looks like: prophase prometaphase meta...

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