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

Meiosis

Genetics

9. Mitosis and Meiosis

Meiosis

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Multiple Choice

Which of the following processes occurs during both Meiosis I and Meiosis II?

Crossing over between homologous chromosomes

Separation of sister chromatids

Formation of spindle fibers

Synapsis of homologous chromosomes

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Verified step by step guidance

Step 1: Understand the key events of Meiosis I and Meiosis II. Meiosis I is the reductional division where homologous chromosomes separate, and Meiosis II is the equational division where sister chromatids separate.

Step 2: Identify the processes listed and recall when they occur: Crossing over between homologous chromosomes happens during Prophase I of Meiosis I; Separation of sister chromatids occurs during Anaphase II of Meiosis II; Synapsis of homologous chromosomes occurs during Prophase I of Meiosis I.

Step 3: Consider the formation of spindle fibers, which are structures made of microtubules that help separate chromosomes. Spindle fibers form during the prophase stage of both Meiosis I and Meiosis II to facilitate chromosome movement.

Step 4: Conclude that since spindle fibers are necessary for chromosome movement in both divisions, their formation occurs during both Meiosis I and Meiosis II.

Step 5: Summarize that the correct answer is the process that happens in both divisions, which is the formation of spindle fibers.