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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

Pleiotropy

Genetics

3. Extensions to Mendelian Inheritance

Pleiotropy

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Multiple Choice

A pleotropic trait is controlled by…

1 gene

2 genes

3 genes

4+ genes

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Verified step by step guidance

Understand the concept of pleiotropy: Pleiotropy occurs when one gene influences multiple phenotypic traits. This means that a single gene can have multiple effects on an organism's phenotype.

Identify the number of genes involved in pleiotropy: Since pleiotropy is defined by the influence of a single gene on multiple traits, it is controlled by one gene.

Consider examples of pleiotropy: For instance, the gene responsible for Marfan syndrome affects connective tissue, leading to multiple symptoms such as long limbs, heart issues, and eye problems.

Differentiate pleiotropy from polygenic traits: Polygenic traits are influenced by multiple genes, whereas pleiotropic traits are influenced by a single gene.

Review the options given in the problem: The correct answer is the option that states '1 gene', as pleiotropy involves a single gene affecting multiple traits.