University:
York University
Course:
BIOL 107 | Introduction to Cell Biology
Academic year:

2024
Views:

385

Pages:

1
Author:

Ciara T.

Evolution What is Evolution? • describes a change in a population over time (slow/gradual) population change can happen in different ways evolution cannot just be reduced to "survival of the fittest" mutations: changes to sequences of DNA random genetic mutation contributes to evolution THEORY of Evolution (Charles Darwin & Alfred Russel Wallace) i) all species related by common ancestry ii) characteristics of species modified from generation: "descent thru modification" For a population to change through natural selection..... There must be variation in the population variation needs to be inherited (passed on from gen to gen) Something causes differential survival in population The traits of the surviving population are inherited by the next generation Genetic composition of the surviving population has changed = evolution The traits will be inherited by the next gen Evolutionary Change • Common traits in population occur by natural selection acting on individuals • Evolution is change in population over time is the observable pattern natural selection is the process by which evolution occurs What is evolution and how does it work? Variation in population and differential survival & reproduction in selected traits → Frequency of selected traits ↑ → Change in population over time Variation is heritable: