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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

In the context of aneuploidy, how would the presence of an extra chromosome (trisomy) in a male offspring affect his phenotype?

He would always be phenotypically normal, as extra chromosomes have no effect.

He would develop as a female due to the extra chromosome.

He may exhibit developmental abnormalities and characteristic features associated with the specific trisomy.

He would not survive past fertilization due to immediate lethality of all trisomies.

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Verified step by step guidance

Understand that aneuploidy refers to the presence of an abnormal number of chromosomes in a cell, which can lead to developmental and physiological effects.

Recognize that trisomy means having an extra copy of a particular chromosome, resulting in three copies instead of the usual two.

Recall that the effect of trisomy depends on which chromosome is extra; some trisomies are lethal, while others cause specific syndromes with characteristic features.

Note that in males, having an extra chromosome does not typically cause sex reversal (i.e., developing as female), because sex determination depends primarily on the presence of the Y chromosome.

Conclude that a male with trisomy may survive but often exhibits developmental abnormalities and characteristic phenotypic features related to the specific extra chromosome.