Table of contents

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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

Variations of Dominance

Genetics

3. Extensions to Mendelian Inheritance

Variations of Dominance

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Multiple Choice

Which definition best describes polygenic traits?

Traits that are controlled by the combined effects of multiple genes, each contributing to the phenotype

Traits that are determined by a single gene with two alleles showing complete dominance

Traits that result from the interaction between genes and environmental factors

Traits that are influenced by genes located only on the sex chromosomes

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Verified step by step guidance

Understand the term 'polygenic traits' by breaking down the word: 'poly-' means many, and '-genic' relates to genes, so polygenic traits involve multiple genes.

Recognize that polygenic traits are controlled by the combined effects of several genes, each adding a small effect to the overall phenotype, rather than a single gene determining the trait.

Compare polygenic traits to other types of traits, such as those controlled by a single gene with two alleles showing complete dominance, which are not polygenic because only one gene is involved.

Consider that while environmental factors can influence traits, polygenic traits specifically refer to genetic control by multiple genes, not just gene-environment interactions.

Note that traits influenced only by genes on sex chromosomes are called sex-linked traits, which is different from polygenic traits that involve multiple genes across the genome.