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Multiple Choice
Which of the following events is an example of mitosis at work?
A
The alignment of chromosomes along the metaphase plate
B
The replication of DNA during the S phase
C
The fusion of two gametes to form a zygote
D
The separation of homologous chromosomes during meiosis I
Verified step by step guidance
1
Step 1: Begin by understanding the process of mitosis. Mitosis is a type of cell division that results in two genetically identical daughter cells. It involves several stages: prophase, metaphase, anaphase, and telophase.
Step 2: Analyze the options provided. The goal is to identify which event corresponds to mitosis. Recall that mitosis involves the alignment of chromosomes, their separation, and the division of the cell.
Step 3: Examine the first option: 'The alignment of chromosomes along the metaphase plate.' This event occurs during metaphase, a key stage of mitosis, where chromosomes align at the center of the cell to ensure equal distribution to daughter cells.
Step 4: Evaluate the second option: 'The replication of DNA during the S phase.' DNA replication occurs during interphase (specifically the S phase), which is a preparatory phase before mitosis, not part of mitosis itself.
Step 5: Review the remaining options: 'The fusion of two gametes to form a zygote' and 'The separation of homologous chromosomes during meiosis I.' Both of these events are related to sexual reproduction and meiosis, not mitosis. Therefore, they are not examples of mitosis at work.