Chromosome replication in a somatic cell takes place during

Question

BlackTom AI · Accepted Answer

The question asks about when chromosome replication in a somatic cell occurs, so we need to consider the stages of the cell cycle and what happens in each.
Option 1: metaphase. Metaphase is part of mitosis, when chromosomes align at the cell's equator before separation. No DNA replication happens here; replication occurs earlier in the cycle, so this choice is incorrect.
Option 2: anaphase. Anaphase is also a mitotic stage, where sister chromatids are pulled apart toward opposite poles. Since replication has already occurred before mitosis begins, this timing is not when replication happens, making this option incorrect.
Option 3: late prophase. Prophase is the early stage of mitosis when chromosomes condense and the nuclear envelope breaks down. While this is associated with chromosome preparation for segregation, replication itself does not occur here; replication must have preceded mitosis, so this is incorrect.
Option 4: interphase. Interphase encompasses G1, S, and G2 phases, with the S (synthesis) phase specifically dedicated to DNA replication. This is the correct context for replication of chromosomes in a somatic cell, as the cell duplicates its DNA before entering mitosis.
In summary, replication of chromosomal DNA in somatic (non-germline) cells is tightly linked to the S phase within interphase, whereas the subsequent mitotic stages (prophase, metaphase, anaphase) involve chromosome condensation, alignment, and segregation rather than replication.

Chromosome replication in a somatic cell takes place during单项选择题

类似问题

In which phase of the cell cycle does DNA replication (making a second copy of DNA) occur?

Question at position 7 The majority of the lifespan of a cell is spent as this phaseinterphaseanaphaseprophasetelophase

At what stage of the cell cycle would you expect there to be twice the amount of DNA as normal?

Question at position 91 In eukaryotes the replication of chromosomal DNA occurs during:G2 phaseanaphaseG1 phaseprophaseS phase

If A, B, and C represent G1, S, and G2, respectively, then which phase of the cell cycle would you predict to last the longest in duration? Use the data shown in the left panel (Cells without treatment graph) to answer this question.

Use the figure to answer the question below. In the figure, why does the amount of DNA in nucleus decrease from IV to V?

After S phase of interphase, each chromosome contains two sister chromatids.

During what portion of the cell cycle does interphase occur?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单