Multiple Choice
Which group of cells would be least likely to contain cells in the S phase of the cell cycle?
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3. Energy & Cell Processes
Introduction to the Cell Cycle
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How many copies of each gene are present in human skin cells at the G2 phase of interphase?
A
One copy
B
Two copies
C
Eight copies
D
Four copies
Verified step by step guidance1
Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and mitotic phase (M). During interphase, the cell prepares for division.
Focus on the G2 phase: In the G2 phase, the cell has already completed DNA replication during the S phase, resulting in duplicated chromosomes.
Recognize the chromosome structure: Each chromosome consists of two sister chromatids after DNA replication, meaning each gene is duplicated.
Determine the number of gene copies: Since each chromosome has two sister chromatids, there are two copies of each gene per chromatid, totaling four copies per chromosome.
Apply this understanding to human skin cells: Human skin cells are diploid, meaning they have two sets of chromosomes. Therefore, in the G2 phase, each gene has four copies.
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