Evolution
- Created by: JordanF2910
- Created on: 20-04-18 19:21
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- Evolution
- Inheritance
- Vertical
- Parent to offspring -> Asexual & Sexual
- Horizontal
- Prokaryotes & Viruses -> 3 types of exchange. PLASMIDS
- Horizontal (Eukaryotes)
- Vertical
- Natural Selection
- Definition -> non-random increase in the frequency of DNA sequences that increases survival (reduction in deleterious sequences).
- Selection Selection
- Male-to-male
- Female Choice
- Types of Selection Pressures
- Disruptive
- Two extremes favoured
- Stabalising
- Average favoured
- Directional
- One extreme favoured
- Disruptive
- Genetic Drift
- Definition -> increase or decrease of the frequencies of the allels in a population
- Origin of Genetic Drift
- Colonisation
- Founders Effect -> colonising population has different gene frequency from original
- Neutral Mutation -> Gene mutations change by mutation but effect on phenotype is minor
- Chance Event -> random changes to gene frequency
- Colonisation
- Speciation
- Definition -> a group of very similar interbreeding organisms that breed to produce fertile offspring
- Types
- Sympatric
- Ecological
- Behavioral
- Allopatric
- Geographical
- Sympatric
- Isolation -> Mutations -> Natural Selection
- Hybrid Zones
- Zones can form in which the ranges of two very similar and closely related species overlap
- Inheritance
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