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

Overview of interacting Genes

Genetics

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

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Multiple Choice

How does diploidy help to preserve genetic variation in a population?

By promoting the loss of genetic variation through increased homozygosity

By preventing recombination during meiosis

By ensuring that only dominant alleles are expressed and maintained

By allowing recessive alleles to be hidden in heterozygotes, preventing their elimination by selection

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Verified step by step guidance

Understand that diploidy means organisms have two sets of chromosomes, and therefore two alleles for each gene.

Recognize that in diploid organisms, individuals can be heterozygous, carrying one dominant and one recessive allele.

Note that recessive alleles can be 'hidden' in heterozygotes because their effects are not expressed when paired with a dominant allele.

Realize that because recessive alleles are not expressed in heterozygotes, natural selection does not eliminate them as easily, preserving genetic variation.

Conclude that diploidy helps maintain genetic diversity by allowing recessive alleles to persist in the population, even if they are not advantageous when expressed.