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 correctly distinguishes metaphase I from metaphase II during meiosis?

In metaphase I, homologous chromosome pairs align at the metaphase plate, while in metaphase II, individual chromosomes align at the metaphase plate.

In metaphase I, sister chromatids are separated, while in metaphase II, homologous chromosomes are separated.

Metaphase I occurs after DNA replication, while metaphase II occurs before DNA replication.

Crossing over occurs during metaphase II but not during metaphase I.

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Verified step by step guidance

Step 1: Understand the key events of meiosis, which consists of two divisions: meiosis I and meiosis II. Each division has its own stages, including metaphase I and metaphase II.

Step 2: Recall that during metaphase I, homologous chromosome pairs (each consisting of two sister chromatids) align together at the metaphase plate. This is a critical distinction because the homologous pairs are what separate during anaphase I.

Step 3: In contrast, during metaphase II, the chromosomes that align at the metaphase plate are individual chromosomes (each still made up of two sister chromatids), not homologous pairs. This is because meiosis II resembles a mitotic division where sister chromatids separate.

Step 4: Evaluate the incorrect options by considering the biological processes: sister chromatids separate during anaphase II, not metaphase I; DNA replication occurs before meiosis I, not between meiosis I and II; and crossing over occurs during prophase I, not metaphase II.

Step 5: Conclude that the correct distinction is that metaphase I aligns homologous chromosome pairs at the metaphase plate, while metaphase II aligns individual chromosomes.