Multiple Choice
In which phase of the cell cycle is DNA copied, resulting in the formation of sister chromatids?
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11. Cell Division
Introduction to the Cell Cycle
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In a human cell, how many chromosomes and chromatids are present before DNA duplication during the cell cycle?
A
23 chromosomes and 23 chromatids
B
46 chromosomes and 92 chromatids
C
23 chromosomes and 46 chromatids
D
46 chromosomes and 46 chromatids
Verified step by step guidance1
Understand the structure of a human cell: Human cells are diploid, meaning they have two sets of chromosomes, one from each parent.
Identify the number of chromosomes in a human cell: Before DNA duplication, a human cell has 46 chromosomes, which is the total number in a diploid cell.
Clarify the concept of chromatids: Before DNA duplication, each chromosome consists of a single chromatid. Therefore, there are 46 chromatids in total.
Differentiate between chromosomes and chromatids: Chromosomes are structures that contain DNA, while chromatids are the individual strands of a chromosome before duplication.
Conclude the pre-duplication state: Before DNA duplication, a human cell has 46 chromosomes and 46 chromatids, as each chromosome is represented by a single chromatid.
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