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

6. Chromosomal Variation

Chromosomal Mutations: Aberrant Euploidy

Genetics

6. Chromosomal Variation

Chromosomal Mutations: Aberrant Euploidy

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2:01 minutes

Problem 8

Textbook Question

Describe the origin of cultivated American cotton.

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Identify the two main species of cultivated American cotton: Gossypium hirsutum and Gossypium barbadense.

Understand that these species are tetraploid, meaning they have four sets of chromosomes, which is a result of hybridization and polyploidy.

Explore the geographical origin: Gossypium hirsutum is believed to have originated in Central America, while Gossypium barbadense likely originated in the northern part of South America.

Examine the process of domestication: Early humans selected for desirable traits such as fiber length and strength, leading to the cultivated varieties we have today.

Consider the role of genetic diversity and breeding: Modern breeding programs continue to enhance cotton varieties by introducing traits like pest resistance and drought tolerance.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Domestication of Plants

The domestication of plants refers to the process by which wild species are cultivated and selectively bred for desirable traits, such as yield, size, and resistance to pests. This process often involves human intervention to enhance specific characteristics over generations, leading to the development of cultivated varieties. In the case of American cotton, domestication involved selecting for fiber quality and plant robustness.

Gossypium Species

The genus Gossypium includes several species of cotton plants, with Gossypium hirsutum and Gossypium barbadense being the most significant for American cotton production. Gossypium hirsutum, commonly known as upland cotton, is the most widely grown species in the United States, while Gossypium barbadense, known for its long fibers, is often used in high-quality textiles. Understanding these species is crucial for comprehending the genetic diversity and agricultural practices associated with cotton cultivation.

Cultural and Economic Impact

The cultivation of cotton has had profound cultural and economic impacts, particularly in the American South. Cotton became a major cash crop in the 19th century, driving the economy and shaping social structures, including the reliance on slave labor. The historical significance of cotton cultivation is essential for understanding its origins and the development of agricultural practices in the United States.

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