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Multiple Choice
In the context of mitosis, mitosis is the process by which:
A
The cell doubles its DNA content by replicating chromosomes during S phase of the cell cycle
B
Homologous chromosomes pair and exchange segments (crossing over) to generate genetic diversity in gametes
C
A eukaryotic cell divides its nucleus to produce two genetically identical nuclei, typically leading to two genetically identical daughter cells
D
Two haploid nuclei fuse to form a diploid zygote during fertilization
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Verified step by step guidance
1
Step 1: Understand the definition of mitosis. Mitosis is a process of nuclear division in eukaryotic cells that results in two genetically identical daughter nuclei.
Step 2: Recognize that mitosis follows DNA replication, which occurs during the S phase of the cell cycle, so the DNA content is already doubled before mitosis begins.
Step 3: Differentiate mitosis from other processes such as meiosis, where homologous chromosomes pair and crossing over occurs to generate genetic diversity, which is not a feature of mitosis.
Step 4: Note that mitosis results in two diploid nuclei that are genetically identical to the original nucleus, typically leading to two genetically identical daughter cells.
Step 5: Exclude unrelated processes such as fertilization, where two haploid nuclei fuse to form a diploid zygote, as this is not part of mitosis.