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

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

Genetics

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

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Multiple Choice

Which of the following statements is NOT true regarding positive (direct) selection in genetics?

Positive selection increases the frequency of beneficial alleles in a population.

Positive selection is a mechanism that drives adaptive evolution.

Positive selection decreases the reproductive success of individuals carrying beneficial alleles.

Positive selection can lead to the fixation of advantageous mutations over time.

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Verified step by step guidance

Step 1: Understand the concept of positive (direct) selection. Positive selection refers to the process where beneficial alleles increase in frequency within a population because they confer some advantage to individuals carrying them.

Step 2: Analyze the first statement: 'Positive selection increases the frequency of beneficial alleles in a population.' This aligns with the definition of positive selection, so this statement is true.

Step 3: Consider the second statement: 'Positive selection is a mechanism that drives adaptive evolution.' Since positive selection favors advantageous traits, it indeed contributes to adaptive evolution, making this statement true.

Step 4: Evaluate the third statement: 'Positive selection decreases the reproductive success of individuals carrying beneficial alleles.' This contradicts the principle of positive selection because beneficial alleles typically increase reproductive success, so this statement is NOT true.

Step 5: Review the fourth statement: 'Positive selection can lead to the fixation of advantageous mutations over time.' Positive selection can cause beneficial alleles to become fixed (reach 100% frequency) in a population, so this statement is true.