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tangare [24]
2 years ago
14

List the phases of mitosis and what happens during each phase.

Biology
1 answer:
nordsb [41]2 years ago
7 0

Answer:

IINTERPHASE : The DNA in the cell is copied in preparation for cell division, this results in two identical full sets of chromosomes?.

Outside of the nucleus? are two centrosomes, each containing a pair of centrioles, these structures are critical for the process of cell division.

During interphase, microtubules extend from these centrosomes.

PROPHASE : The chromosomes condense into X-shaped structures that can be easily seen under a microscope.

Each chromosome is composed of two sister chromatids, containing identical genetic information.

The chromosomes pair up so that both copies of chromosome 1 are together, both copies of chromosome 2 are together, and so on.

At the end of prophase the membrane around the nucleus in the cell dissolves away releasing the chromosomes.

The mitotic spindle, consisting of the microtubules and other proteins, extends across the cell between the centrioles as they move to opposite poles of the cell.

METAPHASE : The chromosomes line up neatly end-to-end along the centre (equator) of the cell.

The centrioles are now at opposite poles of the cell with the mitotic spindle fibres extending from them.

The mitotic spindle fibres attach to each of the sister chromatids.

ANAPHASE : The sister chromatids are then pulled apart by the mitotic spindle which pulls one chromatid to one pole and the other chromatid to the opposite pole.

TELOPHASE : At each pole of the cell a full set of chromosomes gather together.

A membrane forms around each set of chromosomes to create two new nuclei.

The single cell then pinches in the middle to form two separate daughter cells each containing a full set of chromosomes within a nucleus. This process is known as cytokinesis.

Explanation:

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elena-s [515]

Answer:

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Explanation:

Population may be defined as the smallest unit of ecology and the evolution might occur at the population level.

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3 years ago
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If a diploid cell has 20 chromosomes, how many sister chromatids will be present
Gnom [1K]

Answer:

92 chromatids

Explanation:

During phosphate, the nuclear envelope of the cell (which is where the 92 chromatids are contained) begins to break down. The centrioles, which are the only present in animal cells, separate and each moves to an opposite end of the cell

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3 years ago
Fat-soluble hormones pass through the cell membrane easily. Such hormones are referred to as _________________.
anastassius [24]

Answer:

Steroid hormones

Explanation:

Steroid hormones are the second largest groups of hormones. They are made up of small cholestrol units and are fat soluble, therefore they can pass easily through cell membranes.

Function:

They have roles in many vital functions of our body such as salt and water balance, formation of sexual traits,immunity related functions,metabolism and improving health by withstanding injuries.

Mode of action:

  • Steroids being hormones can effect the processes of body in two ways: They affect the transcription of genes involved in synthesis of certain proteins- this is called genomic level action.
  • They can affect by binding with specific membrane receptors like G-proteins, Ion channels and transporters- non genomic level function. Through these ways, they can affect many mechanisms occurring inside the cell.

Hope it helps!

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