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

3. Extensions to Mendelian Inheritance

Sex Chromosome

Genetics

3. Extensions to Mendelian Inheritance

Sex Chromosome

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Multiple Choice

Which of the follow sex chromosomes can be describes as homogametic?

XX/XY

ZZ/ZW

XX/XO

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Understand the concept of homogametic and heterogametic sex determination systems. In homogametic systems, the individual has two of the same type of sex chromosome, while in heterogametic systems, the individual has two different types of sex chromosomes.

Identify the sex determination system in humans and many other mammals, which is the XX/XY system. In this system, females are XX (homogametic) and males are XY (heterogametic).

Examine the ZZ/ZW system, which is found in birds, some reptiles, and some fish. In this system, males are ZZ (homogametic) and females are ZW (heterogametic).

Consider the XX/XO system, which is found in some insects like grasshoppers. In this system, females are XX (homogametic) and males are XO (heterogametic, where 'O' represents the absence of a second sex chromosome).

Conclude that in the given options, XX in the XX/XY system and XX in the XX/XO system are both examples of homogametic sex chromosomes.