객관식
During the formation of the spindle apparatus in mitosis, which of the following structures must break down?
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3. Energy & Cell Processes
Phases of Mitosis
객관식
During prophase I of meiosis, how many chromosomes are present in a human cell?
A
23 chromosomes
B
46 chromosomes
C
69 chromosomes
D
92 chromosomes
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검증된 단계별 안내1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells, each with half the number of chromosomes of the parent cell.
Recall that human cells are diploid, meaning they have two sets of chromosomes, one from each parent, totaling 46 chromosomes.
During prophase I of meiosis, the cell is still in its diploid state, so it contains the full set of chromosomes, which is 46.
In prophase I, homologous chromosomes pair up and exchange segments in a process called crossing over, but the total number of chromosomes remains the same at this stage.
Therefore, during prophase I of meiosis in a human cell, there are 46 chromosomes present.
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