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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

6. Chromosomal Variation

Chromosomal Mutations: Aneuploidy

Genetics

6. Chromosomal Variation

Chromosomal Mutations: Aneuploidy

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Multiple Choice

If nondisjunction occurs during meiosis and an individual survives, which of the following chromosomal conditions is most likely to be observed?

Polyploidy, with entire extra sets of chromosomes

No change in chromosome number

Deletion of a single gene

Aneuploidy, such as trisomy or monosomy

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Verified step by step guidance

Understand the concept of nondisjunction: it is the failure of homologous chromosomes or sister chromatids to separate properly during meiosis I or meiosis II, respectively.

Recognize that nondisjunction leads to gametes with abnormal numbers of chromosomes, either extra or missing chromosomes, rather than entire extra sets of chromosomes.

Recall that polyploidy refers to having entire extra sets of chromosomes (e.g., triploidy), which usually results from errors in cell division other than nondisjunction during meiosis.

Identify that deletion of a single gene is a small-scale mutation and not related to nondisjunction, which affects whole chromosomes.

Conclude that the chromosomal condition most likely observed after nondisjunction is aneuploidy, which includes trisomy (an extra chromosome) or monosomy (a missing chromosome).