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

The mosquito Aedes aegypti has a karyotype of 2n = 6. Which of the following diagrams correctly represents the chromosome arrangement during metaphase II of meiosis in one cell?

A diagram showing 3 chromosomes aligned at the metaphase plate, each consisting of two sister chromatids.

A diagram showing 6 single chromatids aligned at the metaphase plate.

A diagram showing 6 chromosomes aligned at the metaphase plate, each consisting of two sister chromatids.

A diagram showing 3 pairs of homologous chromosomes aligned at the metaphase plate.

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Verified step by step guidance

Understand the chromosome number and ploidy: The mosquito has a diploid number 2n = 6, meaning there are 6 chromosomes total in a somatic cell, arranged as 3 pairs of homologous chromosomes.

Recall the stages of meiosis: Meiosis consists of two divisions, meiosis I and meiosis II. Metaphase I aligns homologous chromosome pairs, while metaphase II aligns individual chromosomes (each with sister chromatids).

Identify the chromosome arrangement at metaphase II: After meiosis I, cells are haploid (n = 3), each chromosome still consists of two sister chromatids. Therefore, at metaphase II, 3 chromosomes (each with two chromatids) align at the metaphase plate.

Compare the options with the expected arrangement: The correct diagram should show 3 chromosomes aligned, each made of two sister chromatids, reflecting the haploid number and duplicated state of chromosomes at metaphase II.

Exclude incorrect options: Diagrams showing 6 single chromatids or 6 chromosomes with sister chromatids correspond to diploid or earlier stages, and diagrams showing pairs of homologous chromosomes correspond to metaphase I, not metaphase II.