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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

3. Extensions to Mendelian Inheritance

Sex Chromosome

Genetics

3. Extensions to Mendelian Inheritance

Sex Chromosome

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Multiple Choice

How many chromosomes does a human haploid cell have?

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Understand the difference between haploid and diploid cells: Haploid cells contain one complete set of chromosomes, while diploid cells contain two sets (one from each parent).

Recall that human somatic (body) cells are diploid and have 46 chromosomes in total, arranged in 23 pairs.

Since haploid cells have only one set of chromosomes, the number of chromosomes in a haploid human cell is half the diploid number.

Calculate the haploid chromosome number by dividing the diploid number (46) by 2, using the formula: $\text{haploid number} = \frac{\text{diploid number}}{2}$.

Conclude that the haploid number of chromosomes in humans is 23.