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A) how do the chromosomes of the body cells compare with the chromosomes in the fertilised egg from which they came?
And describe what happens to chromosome in the nucleus of a body cells when it forms reproductive cells
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And describe what happens to chromosome in the nucleus of a body cells when it forms reproductive cells
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when the the body cells form reproductive cells the number of chromosomes is halved so each daughter cell contains 23 chromosomes. There are two divisions in meiosis, so before the first division, the number is doubled in dna replication and then the first division halves that number producing 2 genetically identical diploid (46 chromosomes) daughter cells and then the second division halves that number to produce haploid(23 chromosomes) daughter cells- these are gametes (reproductive cells)
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(Original post by Mil23333)
when the the body cells form reproductive cells the number of chromosomes is halved so each daughter cell contains 23 chromosomes. There are two divisions in meiosis, so before the first division, the number is doubled in dna replication and then the first division halves that number producing 2 genetically identical diploid (46 chromosomes) daughter cells and then the second division halves that number to produce haploid(23 chromosomes) daughter cells- these are gametes (reproductive cells)
when the the body cells form reproductive cells the number of chromosomes is halved so each daughter cell contains 23 chromosomes. There are two divisions in meiosis, so before the first division, the number is doubled in dna replication and then the first division halves that number producing 2 genetically identical diploid (46 chromosomes) daughter cells and then the second division halves that number to produce haploid(23 chromosomes) daughter cells- these are gametes (reproductive cells)
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