Presentation - university.pptxdahbdajdbadba
- 1. Natural Selection and Selective Breeding: Understanding Evolutionary Processes
- 2. Introduction to Natural Selection â—Ź Natural selection is a process where certain traits become more common in a population over time â—Ź These traits help organisms survive and reproduce better in their environment â—Ź Involves genetic variation, production of many offspring, and struggle for survival â—Ź How do you think natural selection might affect a population over many generations?
- 3. Key Elements of Natural Selection â—Ź Genetic variation within a population â—Ź Production of many offspring â—Ź Competition for resources and survival â—Ź Better adapted individuals have higher chance of reproducing â—Ź Advantageous traits are passed on to next generations â—Ź What might be an example of an advantageous trait in your local environment?
- 4. Example: Natural Selection in Beetles â—Ź Population of beetles with variation in color (green and brown) â—Ź Brown beetles have better camouflage on tree bark â—Ź Predators easily spot green beetles â—Ź Brown beetles more likely to survive and reproduce â—Ź Over time, proportion of brown beetles increases in population â—Ź Can you think of other examples where camouflage provides an advantage?
- 5. Adaptation through Natural Selection â—Ź Adaptation: Process by which populations become more suited to their environment â—Ź Results from natural selection over many generations â—Ź Helps organisms survive and thrive in specific environments â—Ź What adaptations have you observed in local wildlife?
- 6. Antibiotic Resistance: Natural Selection in Action â—Ź Some bacteria have genetic mutations making them resistant to antibiotics â—Ź When antibiotics are used, resistant bacteria survive and reproduce â—Ź Leads to large populations of resistant bacteria â—Ź Antibiotics become ineffective over time â—Ź How might this impact human health and medicine?
- 7. Introduction to Selective Breeding â—Ź Also known as artificial selection â—Ź Process where humans choose individuals with desirable features to breed â—Ź Selected individuals produce next generation â—Ź Offspring with desired features are chosen for further breeding â—Ź How is this different from natural selection?
- 8. Selective Breeding in Plants â—Ź Enhances traits like disease resistance, crop yield, and flavor â—Ź Improves adaptation to challenging weather conditions â—Ź Develops plants with unique or large flowers â—Ź Can you name a fruit or vegetable that has been selectively bred?
- 9. Example: Breeding Disease-Resistant Crops â—Ź Identify plants with disease resistance â—Ź Cross-breed resistant plants â—Ź Select offspring with increased resistance â—Ź Continue breeding and selection over generations â—Ź Develop new, more resilient varieties â—Ź What might be the potential drawbacks of this process?
- 10. Selective Breeding in Animals â—Ź Develops specific traits over multiple generations â—Ź Examples: High milk-producing cows, chickens laying large eggs â—Ź Creates domestic dogs with specific characteristics â—Ź Produces sheep with high-quality wool â—Ź Breeds horses for speed and fine features â—Ź Can you think of an animal breed developed for a specific purpose?
- 11. Natural vs. Artificial Selection: Key Differences â—Ź Natural selection occurs without human intervention; artificial selection is human-driven â—Ź Natural selection enhances survival in specific environments; artificial selection focuses on human-desired traits â—Ź Natural selection typically occurs over long periods; artificial selection can produce rapid changes â—Ź How might artificial selection impact biodiversity? Discuss potential pros and cons.
Editor's Notes
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