IIT JAM Exam > IIT JAM Questions > A cell with 46 chromosomes undergoing meiosis...
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A cell with 46 chromosomes undergoing meiosis will have
- a)92 chromatids at metaphase I and 46 chromatids at metaphase II
- b)23 chromosomes at metaphase I and 23 chromosomes at metaphase II
- c)92 chromatids at metaphase I and 23 chromatids at metaphase II
- d)23 chromatids at metaphase I and 23 chromatids at metaphase II
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
A cell with 46 chromosomes undergoing meiosis will havea)92 chromatids...
Explanation:
Meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes as the parent cell. In humans, a cell with 46 chromosomes undergoes meiosis to produce four daughter cells, each with 23 chromosomes.
Chromosomes and chromatids:
Before diving into the answer, it is important to understand the difference between chromosomes and chromatids. Chromosomes are thread-like structures that contain genetic information in the form of genes. Each chromosome consists of two identical sister chromatids, held together at a region called the centromere.
Stages of meiosis:
Meiosis consists of two rounds of cell division, known as meiosis I and meiosis II. Each round involves a series of stages, including prophase, metaphase, anaphase, and telophase.
At the end of meiosis I, the cell has undergone reduction division, meaning the number of chromosomes has been halved. Therefore, in a cell with 46 chromosomes undergoing meiosis, there will be 23 chromosomes at the end of meiosis I.
Answer:
At metaphase I, the chromosomes are lined up in pairs (homologous pairs) at the equator of the cell. In a cell with 46 chromosomes, there will be 92 chromatids present at this stage, as each chromosome consists of two sister chromatids.
During anaphase I, the homologous pairs separate and move towards opposite poles of the cell. Each pole now has a haploid number of chromosomes (23 in humans), but each chromosome still consists of two sister chromatids.
During meiosis II, the sister chromatids separate, resulting in four daughter cells, each with a haploid number of chromosomes (23 in humans) and a single chromatid per chromosome. Therefore, at metaphase II, there will be 46 chromatids present in a cell that initially had 46 chromosomes.
Conclusion:
In summary, a cell with 46 chromosomes undergoing meiosis will have 92 chromatids at metaphase I and 46 chromatids at metaphase II.
Meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes as the parent cell. In humans, a cell with 46 chromosomes undergoes meiosis to produce four daughter cells, each with 23 chromosomes.
Chromosomes and chromatids:
Before diving into the answer, it is important to understand the difference between chromosomes and chromatids. Chromosomes are thread-like structures that contain genetic information in the form of genes. Each chromosome consists of two identical sister chromatids, held together at a region called the centromere.
Stages of meiosis:
Meiosis consists of two rounds of cell division, known as meiosis I and meiosis II. Each round involves a series of stages, including prophase, metaphase, anaphase, and telophase.
At the end of meiosis I, the cell has undergone reduction division, meaning the number of chromosomes has been halved. Therefore, in a cell with 46 chromosomes undergoing meiosis, there will be 23 chromosomes at the end of meiosis I.
Answer:
At metaphase I, the chromosomes are lined up in pairs (homologous pairs) at the equator of the cell. In a cell with 46 chromosomes, there will be 92 chromatids present at this stage, as each chromosome consists of two sister chromatids.
During anaphase I, the homologous pairs separate and move towards opposite poles of the cell. Each pole now has a haploid number of chromosomes (23 in humans), but each chromosome still consists of two sister chromatids.
During meiosis II, the sister chromatids separate, resulting in four daughter cells, each with a haploid number of chromosomes (23 in humans) and a single chromatid per chromosome. Therefore, at metaphase II, there will be 46 chromatids present in a cell that initially had 46 chromosomes.
Conclusion:
In summary, a cell with 46 chromosomes undergoing meiosis will have 92 chromatids at metaphase I and 46 chromatids at metaphase II.
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A cell with 46 chromosomes undergoing meiosis will havea)92 chromatids...
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A cell with 46 chromosomes undergoing meiosis will havea)92 chromatids at metaphase I and 46 chromatids at metaphase IIb)23 chromosomes at metaphase I and 23 chromosomes at metaphase IIc)92 chromatids at metaphase I and 23 chromatids at metaphase IId)23 chromatids at metaphase I and 23 chromatids at metaphase IICorrect answer is option 'A'. Can you explain this answer?
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