Species - Process of Evolution 1. Variations (among...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Process of Evolution 1. Variations (among individuals in all populations, in all groups of organisms) are produced by chance mutations 2. Selection does not necessarily produce well-adapted species; some may be driven to extinction; Organisms are adapted to particular environment 3. Natural Selection selects the “fittest” organisms 4. Process occurs constantly in all species of life on earth
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Natural Selection Adaptation of a population to the biotic and abiotic environment Requires: - Variation - The members of a population differ from one another - Inheritance - Many differences are heritable genetic differences - Differential Adaptiveness - Some differences affect survivability - Differential Reproduction – Some differences affect likelihood of successful reproduction Results in: - A change in allele frequencies in the gene pool - Improved fitness of the population
Background image of page 2
Types of Selection 1. Directional Selection - Extreme phenotype is favored - Curve shifts in that direction Examples: Size of Modern Horse Industrial Melanism Antibiotic-resistant Bacteria DDT-resistant Mosquitoes
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

Species - Process of Evolution 1. Variations (among...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online