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 best describes a dihybrid cross involving two genes that interact epistatically?

A cross between individuals homozygous for two genes, resulting in independent assortment

A cross involving a single gene with two alleles showing incomplete dominance

A cross between individuals heterozygous for two genes, where one gene masks the expression of the other

A cross between two individuals with identical genotypes for both genes

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Verified step by step guidance

Understand what a dihybrid cross is: it involves two genes, each with two alleles, and typically examines how these genes assort and interact in offspring.

Recall the concept of epistasis: this occurs when the expression of one gene masks or modifies the expression of another gene at a different locus.

Identify the genotypes involved in a dihybrid cross with epistasis: usually, both parents are heterozygous for both genes (e.g., AaBb x AaBb), allowing observation of gene interactions in the progeny.

Recognize that independent assortment refers to genes segregating without influencing each other, which is not the case in epistasis where one gene affects the expression of the other.

Conclude that the best description of a dihybrid cross involving epistasis is a cross between individuals heterozygous for two genes, where one gene masks the expression of the other.