Table of contents

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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

In which stage of mitosis do the chromosomes first appear to be doubled or replicated under a microscope?

Anaphase

Telophase

Metaphase

Prophase

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Verified step by step guidance

Recall the stages of mitosis: prophase, metaphase, anaphase, and telophase, and understand the key events that characterize each stage.

Understand that chromosomes become visible under a microscope when they condense and become tightly coiled, which happens early in mitosis.

Recognize that during prophase, the chromatin condenses into distinct chromosomes, and each chromosome has already been replicated during the preceding S phase of interphase, so they appear doubled.

Note that in metaphase, chromosomes align at the cell's equator, still appearing as doubled structures (sister chromatids), but this is not the first stage where they become visible.

Conclude that the first stage where chromosomes appear doubled and visible under a microscope is prophase, as this is when condensation occurs and replicated chromosomes become distinguishable.