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1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

9. Mitosis and Meiosis

Mitosis

Genetics

9. Mitosis and Meiosis

Mitosis

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Multiple Choice

During prophase of mitosis in a human somatic cell, how many replicated chromosomes are present?

23 replicated chromosomes

None; chromosomes are unreplicated during prophase

92 replicated chromosomes

46 replicated chromosomes

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Verified step by step guidance

Recall that a human somatic cell is diploid, containing 46 chromosomes in total (23 pairs).

Understand that before mitosis begins, during the S phase of interphase, each chromosome is replicated, resulting in two sister chromatids per chromosome.

During prophase of mitosis, chromosomes are already replicated, meaning each chromosome consists of two sister chromatids joined at the centromere.

Since the cell started with 46 chromosomes, and each is replicated, the number of replicated chromosomes remains 46, but each consists of two chromatids.

Therefore, the number of replicated chromosomes present during prophase is 46, not 23 or 92, because the count is based on chromosome number, not chromatids.