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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 the G2 phase of the cell cycle, are sister chromatids present in a typical human somatic cell?

Yes, but only in cells undergoing meiosis.

No, sister chromatids are only formed during mitosis.

Yes, because DNA replication has already occurred in S phase, resulting in sister chromatids.

No, sister chromatids are present only in the G1 phase.

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Verified step by step guidance

Recall the stages of the cell cycle: G1 phase (cell growth), S phase (DNA replication), G2 phase (preparation for mitosis), and M phase (mitosis).

Understand that sister chromatids are identical copies of a chromosome connected by a centromere, formed during DNA replication in the S phase.

Since DNA replication occurs during the S phase, by the time the cell reaches the G2 phase, each chromosome consists of two sister chromatids.

Recognize that sister chromatids remain attached through G2 and are separated during mitosis, so they are present in typical human somatic cells during G2.

Conclude that the presence of sister chromatids in G2 phase is due to the completion of DNA replication in S phase, not limited to meiosis or mitosis only.