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

3. Extensions to Mendelian Inheritance

Sex Chromosome

Genetics

3. Extensions to Mendelian Inheritance

Sex Chromosome

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Multiple Choice

How many chromosomes are present in a human zygote?

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Recall that a human zygote is formed by the fusion of two gametes: one sperm and one egg.

Each gamete (sperm or egg) contains half the number of chromosomes found in a typical body cell, which is called the haploid number (n). For humans, this number is 23.

When the sperm and egg fuse during fertilization, their chromosomes combine to restore the full set of chromosomes, called the diploid number (2n).

Calculate the total number of chromosomes in the zygote by adding the haploid numbers from each gamete: $2n = n + n = 23 + 23$.

Therefore, the human zygote contains 46 chromosomes, which is the diploid number for humans.