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

6. Chromosomal Variation

Chromosomal Mutations: Aneuploidy

Genetics

6. Chromosomal Variation

Chromosomal Mutations: Aneuploidy

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Multiple Choice

The most common extra-chromosome condition in humans is:

Monosomy X (Turner syndrome)

Trisomy 18 (Edwards syndrome)

Trisomy 13 (Patau syndrome)

Trisomy 21 (Down syndrome)

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Verified step by step guidance

Understand that the question asks for the most common extra-chromosome condition in humans, which refers to a condition caused by an abnormal number of chromosomes (aneuploidy).

Recall that monosomy means missing one chromosome from a pair, while trisomy means having an extra chromosome, resulting in three copies instead of two.

Review the common aneuploidy conditions: Monosomy X (Turner syndrome) involves a missing X chromosome in females; Trisomy 18 (Edwards syndrome) and Trisomy 13 (Patau syndrome) involve extra copies of chromosomes 18 and 13 respectively.

Recognize that Trisomy 21, also known as Down syndrome, is the most frequent trisomy condition compatible with life and is the most common extra-chromosome condition in humans.

Summarize that among the options, Trisomy 21 (Down syndrome) is the correct answer because it occurs more frequently than the other listed conditions.