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
- 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

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Multiple Choice

If there are 20 sister chromatids in a cell during mitosis, how many chromosomes are present in that cell?

Verified step by step guidance

Recall that during mitosis, each chromosome is replicated and consists of two sister chromatids joined at the centromere.

Understand that the number of sister chromatids is twice the number of chromosomes because each chromosome has two chromatids after DNA replication.

Set up the relationship: Number of sister chromatids = 2 × Number of chromosomes.

Given that there are 20 sister chromatids, use the equation 20 = 2 × Number of chromosomes to find the number of chromosomes.

Solve for the number of chromosomes by dividing both sides of the equation by 2: Number of chromosomes = 20 ÷ 2.

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