L4 ch 24 - Lecture 4: Ch-24 Evolution-II Darwinian Fitness...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 4: Ch-24 Evolution-II Darwinian Fitness The relative likelihood that a genotype will contribute to the gene pool of the next generation as compared with other genotypes. Is a measure of reproductive success The average reproductive success of members in a population is called the mean fitness of the population. If individuals with a higher fitness increase in numbers, then the population is said to be well-adapted to its environment. Patterns of Natural Selection: Directional, Stabilizing, Disruptive, Balancing, and Sexual Natural selection leads to adaptation so that a species is better able to survive long enough to reproduce. Types of Selection: Directional, Stabilizing, Disruptive, Balancing, and Sexual Directional Stabilizing Disruptive Directional Stabilizing Disruptive Directional-favors extreme phenotypes; changes the average value of a trait by favoring one direction Stabilizing- favors intermediate phenotypes; reduces the amount of variation in a trait by
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/28/2011 for the course BIO 181 taught by Professor Milton during the Fall '08 term at N.C. State.

Page1 / 2

L4 ch 24 - Lecture 4: Ch-24 Evolution-II Darwinian Fitness...

This preview shows document pages 1 - 2. Sign up to view the full document.

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