Textbook Notes (378,268)
CA (167,148)
UTSC (19,205)
BIOA02H3 (153)
Chapter 22

Chapter 22: Mechanisms of Evolution--KEY TERMS & DEFINITIONS

4 Pages
90 Views

Department
Biological Sciences
Course Code
BIOA02H3
Professor
Kamini Persaud

This preview shows page 1. Sign up to view the full 4 pages of the document.
Key TermsChapter 22: The Mechanisms of Evolution
22.1-What facts form the base of our understanding of evolution?
According to Darwin, the major features of evolutionary change are:
oSpecies are not immutable, they change over time
oThe process that produces these changes is natural selection
Variations among individuals affect the chance that a given individual will survive
and reproduce. Darwin called this differential survival and reproduction of
individuals natural selection.
Artificial selection: individuals with certain desirable traits by animal and plant
breeders.
Population: a group of individuals of a single species that live and interbreed in a
particular geographic area at the same time.
Adaptation: refers to the process by which characteristics appear to be useful to
their bearers evolve (evolutionary mechanisms), and to the characteristics
themselves.
oAn adaptation is a phenotypic characteristic that has helped an organism
adjust to conditions in its environment.
For a population to evolve, its members much possess heritable genetic variation,
which is the raw material on which mechanisms of evolution act.
Heritable trait: a characteristic of an organism that is at least partly determined
by its genes. The genetic constitution that governs a characteristic is called a
genotype. A population evolves when individuals with different genotypes
survive or reproduce at different rates.
Population genetics:
oTo explain the origin and maintenance of generic variation
oTo explain the patterns and organization of genetic variation
oTo understand the mechanism that cause changes in allele frequencies in
populations
Different forms of genes, called alleles, may exist at a particular locus.
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Key TermsChapter 22: The Mechanisms of Evolution 22.1-What facts form the base of our understanding of evolution? According to Darwin, the major features of evolutionary change are: o Species are not immutable, they change over time o The process that produces these changen saiural selection Variations among individuals affect the chance that a given individual will survive and reproduce. Darwin called this differential survival and reproduction of individualsnatural selection. Artificial selection: individuals with certain desirable traits by animal and plant breeders. Population: a group of individuals of a single species that live and interbreed in a particular geographic area at the same time. Adaptation: refers to the process by which characteristics appear to be useful to their bearers evolve (evolutionary mechanisms), and to the characteristics themselves. o An adaptation is a phenotypic characteristic that has helped an organism adjust to conditions in its environment. For a population to evolve, its members much possess heritable genetic variation, which is the raw material on which mechanisms of evolution act. Heritable trait: a characteristic of an organism that is at least partly determined by its genes. The genetic constitution that governs a characteristic is called a genotype. A population evolves when individuals with different genotypes survive or reproduce at different rates. Population genetics: o To explain the origin and maintenance of generic variation o To explain the patterns and organization of genetic variation o To understand the mechanism that cause changes in allele frequencies in populations Different forms of genes, calle adlleles, may exist at a particular locus. www.notesolution.com
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit