Summary
Summary OCR A-Level Biology 6.2.12 Hardy Weinberg Principle
- Course
- Institution
- Book
Revision summary of key knowledge from OCR A-Level Biology 6.2.12 Hardy Weinberg Principle.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
OCR A-level Biology notes
-
OCR A-Level Biology 6.3.5 Gel Electrophoresis
-
OCR A-Level Biology 6.3.4 Polymerase Chain Reaction
Seller
Follow
izzylewington04
Content preview
Hardy-Weinberg PrincipleFactors Affecting Allele Frequency
Mutation Rate
Migration and Isolation
Population Size
Natural Selection
Environmental Change
Genetic Drift
Gene Flow
Non-random Mating
Hardy-Weinberg Principle
Assumptions:
o Population is large enough to make sampling error negligible
o Mating in the population is random
o No selective pressures for or against any genotype so no selection
o No mutation, migration or genetic drift
Frequency of dominant allele = p
Frequency of recessive allele = q
Only two alleles in population so p + q = 100% or 1.0
Possible allele combinations:
o Homozygous Dominant: pp = p²
o Homozygous Recessive: qq = q²
o Heterozygous x2: pq x2 = 2pq
p² + 2pq + q² = 100% or 1.0
Examples:
25% population recessive trait, 75% 36% population recessive trait, 64%
dominant trait dominant trait
q² = 0.25 so q=0.5 q² = 0.36 so q=0.6
1.0 – 0.5 = p = 0.5 1.0 – 0.6 = p = 0.4
2pq = 2x0.5x0.5 = 0.5 2pq = 2x0.4x0.6 = 0.48
So 50% of the population are So 48% of the population are
heterozygous heterozygous
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50843 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now