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Sagot :
The answer is true. There are two haploid cells with two sister chromatids per chromosome at the conclusion of meiosis I.
After meiosis I, a chromosome's two chromatids are genetically separate. After homologous chromosomes separate during meiosis I, two haploid cells are produced.
what is meiosis phases ?
DNA is copied prior to meiosis, just as it is during mitosis. Then, during meiosis, two cell divisions—meiosis I and meiosis II—take place. The DNA is divided into daughter cells during the first division, which is composed of several steps. The two alleles of each gene are divided into distinct cells in the division that immediately follows the initial division. each gene has 4 copies, each of which is present in 2 complete sets of DNA with 2 alleles in each set.
what are the Phases of Meiosis I ?
1. Prophase I
Condensed chromosomes adhere to the nuclear membrane.
A tetrad is created when synapsis takes place (when a pair of homologous chromosomes line up closely together). Four chromatids make up each tetrad. By crossing over, genetic recombination might take place. The nuclear membrane thins as the chromosomes separate from it. The nuclear envelope and nucleoli disintegrate, and the centrioles move apart similarly to mitosis. The chromosomes also start moving toward the metaphase plate.
2. Metaphase I
At the metaphase plate, tetrads align.
As you can see, homologous chromosome centromeres are oriented toward the opposing cell poles.
3. Anaphase I
The movement of chromosomes to opposing cell poles. Similar to mitosis, the chromosomes are drawn to the cell poles by the interaction of microtubules like the kinetochore fibers.
Unlike mitosis, sister chromatids do not split once homologous chromosomes move to opposing poles.
4. Telophase I
The homologous chromosomes are still being moved to the poles by the spindle fibers.
Once movement is complete, each pole contains a haploid number of chromosomes.
Most of the time, cytokinesis—the division of the cytoplasm—occurs concurrently with telophase I.
At the end of telophase I and cytokinesis, two daughter cells are produced, each of which has half as many chromosomes as the original parent cell.
Different activities take place in anticipation of meiosis II depending on the kind of cell. There is one thing that never changes, though: the genetic material never reproduces.
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True
At the end of meiosis i, there are two haploid cells, each with two sister chromatids per chromosome.
What are happens in meiosis i?
- When gametes are created, the first nuclear division, known as meiosis I, occurs.
- It is also known as the reduction division because the resultant cells have half as many chromosomes as the parent cell.
- The four phases of Meiosis I are Prophase I, Metaphase I, Anaphase I, and Telophase I.
Prophase 1:
- During prophase I, the chromosomes condense and become visible inside the nucleus.
- Each chromosome pair's members fit next to one another after this chromosomal condensation, and because of their similar size and gene content, they are known as homologous chromosomes.
- At this stage, a process known as synaptic attachment takes place between each pair of chromosomes along its length.
- The people within each pair then cross across, commonly known as recombination, to swap nearby fragments of DNA while the homologous chromosomes are firmly connected.
- After prophase I, the nuclear membrane gradually begins to degrade.
Metaphase 1
- At the start of metaphase I, microtubules depart from the spindle and join the kinetochore near each chromosome's centromere.
- More specifically, in each homologous pair, microtubules from one spindle side bind to one chromosome while those from the other spindle side do the same for the other chromosome.
- These microtubules then help the chromosomal pairs arrange themselves to form the metaphase plate, which is located along the equator of the cell.
Anaphase 1
- The dissolution and contraction of the microtubules, which cause the two chromosomes in each pair to be dragged toward the opposite ends of the cell, separate the homologous chromosomes during anaphase I.
- Each daughter cell that emerges from meiosis I will have half as many chromosomes as the original parent cell after interphase as a result of this division.
- The sister chromatids of each chromosome are still linked.
Telophase 1:
- As the new chromosomes get closer to the spindle, the cytoplasm organizes and divides into two during telophase I.
- The two remaining cells each contain half as many chromosomes as their progenitor cell did.
- The two daughter cells were not genetically similar to each other due to the recombination that occurred during prophase I.
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