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Multiple Choice
Which of the following best represents the chromosomal composition of one daughter nucleus at telophase of mitosis in a diploid cell with 2n = 4?
A
Two chromosomes, each consisting of two sister chromatids (total of 4 chromatids)
B
Four chromosomes, each consisting of a single chromatid (total of 4 chromatids)
C
Four chromosomes, each consisting of two sister chromatids (total of 8 chromatids)
D
Two chromosomes, each consisting of a single chromatid (total of 2 chromatids)
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 daughter cells, each with the same number of chromosomes as the parent cell. In a diploid cell (2n), the chromosome number remains constant throughout mitosis.
Step 2: Recall the key events of mitosis. During telophase, the chromosomes have already been separated into two sets, and the nuclear envelope reforms around each set. The sister chromatids that were separated during anaphase are now individual chromosomes in the daughter nuclei.
Step 3: Analyze the chromosomal composition at telophase. Since the sister chromatids have separated, each daughter nucleus will contain chromosomes that consist of a single chromatid. The total number of chromosomes in each daughter nucleus will match the diploid number of the parent cell (2n = 4).
Step 4: Translate the diploid number (2n = 4) into the chromosomal composition. Each daughter nucleus will have four chromosomes, and since the chromatids have separated, each chromosome will consist of a single chromatid. This results in a total of 4 chromatids per daughter nucleus.
Step 5: Compare the options provided in the problem. The correct representation of the chromosomal composition at telophase is: 'Four chromosomes, each consisting of a single chromatid (total of 4 chromatids).' This matches the biological process described.