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miskamm [114]
4 years ago
13

During the production of gametes, the chromosomes of a cell have condensed, and the chromatids of homologous chromosomes are cro

ssing over to form new allele combinations. Which of the following is the best conclusion you can make about the life cycle of this cell?
The cell will separate into two daughter cells next, and cytokinesis will occur.

The cell is in prophase I of meiosis and will enter metaphase I next.

The cell will make a copy of each chromosome in order to form diploid daughter cells.

The cell is in interphase II of meiosis and will enter prophase II next.
Biology
2 answers:
snow_tiger [21]4 years ago
7 0

Answer:

The correct answer will be the cell is in prophase I of meiosis and will enter metaphase I next.

Explanation:

Meiosis is a type of cell division which is involved in the formation of haploid gametes.

During meiosis the division of the genetic material is markedly observed and based on this meiosis is divided into 4 phases: prophase, metaphase, anaphase and telophase.

During prophase: the chromatin structure of DNA starts condensing to form chromatids which attaches to homologous chromatids and are known as sister chromatids. These sister chromatids exchange their genetic material via a process called called recombination or crossing over which takes place during pachytene stage of prophase I. After crossing over it is proceeded by the next stage that is metaphase I in which chromosomes gets aligned at the center of the cell.

Thus, the cell is in prophase I of meiosis and will enter metaphase I next is the correct answer.

castortr0y [4]4 years ago
6 0

Answer:

<em>The cell is in prophase I of meiosis and will enter metaphase I next</em>

Explanation:

The life cycle of the cell has 2 main phases;

  • <em>the interphase</em>
  • <em>the m phase</em>

Depending on the type of cell, the interphase include the quiescence, cell development/growth, DNA synthesis, and protein synthesis phase while the m phase is either meiotic (for sex cells) or mitotic (for vegetative cells). Meiotic cell division leads to the production of gametes while mitotic cell division leads to the production of replica daughter cells.

Meiotic cell division is a 2-stage cell division with each stage divided to <em>prophase, metaphase, anaphase</em> and <em>telophase</em>. The first stage is referred to as meiosis I and the second stage meiosis II. On a more simpler note, meiosis can be viewed as consisting of six main sub-stages including <em>prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, and telophase II.</em>

During prophase I, the nuclear materials in a cell condenses and becomes visible as threads. This stage is sometimes referred to as leptotene or leptonema stage.

Thereafter, homologous chromosomes start pairing up to form a bivalent/tetrad. Paired homologous chromosomes exchange chromosomal segments between non-sister chromatids in a process known as crossing over or genetic recombination at the pachynema stage.

Zygonema/zygotene and diplonema/diplotene stages quickly follow during which paired chromosomes disengage except at the point of crossing over.

Prophase I is completed with a process of diakiness before the cell exits to metaphase I.

<em>Thus, at the end of prophase I, chromosomes have condensed, crossing over has taken place and the cell moves to metaphase I</em>

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Provide brief overview of the nervous system and its role in the maintenance of homeostasis.
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Explanation:

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Central Nervous System: Composed of the brain (inside the skull) and the spinal cord (inside the spinal column).

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Peripheral nervous system: it is everything that is outside the bone cavity and is formed by the nerves and nerve ganglia that extend outside the central nervous system.

The peripheral nervous system has a somatic component, which is associated with the voluntary control of body movements through the use of skeletal muscles. This means that it is responsible for all the functions that we are aware of, including the movement of our arms, legs, and other parts of our body.

On the other hand, the autonomic nervous system is a component of the peripheral nervous system that regulates involuntary physiological processes. These processes include heart rate, blood pressure, breathing, digestion, and sexual arousal. The autonomic nervous system contains three divisions: sympathetic, parasympathetic, and enteric.

Due to the above relationships and anatomical subdivisions we can say that the nervous system is responsible for regulating and maintaining homeostasis. In fact, through its receptors, neurotransmitters, nervous inputs, and outputs, the nervous system keeps us in touch with our environment, both external and internal.

We can conclude that the correct answer is:

Answer:

Overview of the nervous system:

The nervous system has two major anatomical subdivisions:

Central Nervous System: Composed of the brain (inside the skull) and the spinal cord (inside the spinal column).

The brain and spinal cord are responsible for processing and integrating the various sources of information to allow us to develop a response. Therefore, the main function of the somatic nervous system is to connect the Central Nervous System with the organs and skeletal muscle to carry out our daily functions.

Peripheral nervous system: it is everything that is outside the bone cavity and is formed by the nerves and nerve ganglia that extend outside the central nervous system.

The peripheral nervous system has a somatic component, which is associated with the voluntary control of body movements through the use of skeletal muscles. This means that it is responsible for all the functions that we are aware of, including the movement of our arms, legs, and other parts of our body.

On the other hand, the autonomic nervous system is a component of the peripheral nervous system that regulates involuntary physiological processes. These processes include heart rate, blood pressure, breathing, digestion, and sexual arousal. The autonomic nervous system contains three divisions: sympathetic, parasympathetic, and enteric.

Role in the maintenance of homeostasis:

Due to the above relationships and anatomical subdivisions we can say that the nervous system is responsible for regulating and maintaining homeostasis. In fact, through its receptors, neurotransmitters, nervous inputs, and outputs, the nervous system keeps us in touch with our environment, both external and internal.

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