Table of contents
- 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
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
9. Mitosis and Meiosis
Meiosis
2:04 minutes
Problem 5b
Textbook Question
Textbook QuestionThe diploid number of the hypothetical animal Geneticus introductus is 2n = 36. Each diploid nucleus contains 3 ng of DNA in G₁.
What amount of DNA is contained in each nucleus at the end of S phase?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diploid Number
The diploid number (2n) refers to the total number of chromosomes in a somatic cell, which in this case is 36 for the animal Geneticus introductus. This means that there are 18 pairs of homologous chromosomes, with each parent contributing one chromosome to each pair.
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DNA Content in G₁ and S Phase
In the G₁ phase of the cell cycle, the cell contains a specific amount of DNA, which is 3 ng in this scenario. During the S phase, DNA replication occurs, resulting in the duplication of each chromosome, effectively doubling the DNA content in preparation for cell division.
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Amount of DNA Post-Replication
At the end of the S phase, the amount of DNA in each nucleus is doubled compared to the G₁ phase. Therefore, if the G₁ phase contains 3 ng of DNA, after replication in the S phase, each nucleus will contain 6 ng of DNA, reflecting the complete set of duplicated chromosomes.
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