Summary A Level Biology Evolution and Selection Notes
84 views 0 purchase
Course
Unit 16 - P Selection and Evolution
Institution
CIE
Book
Cambridge International AS and A Level Biology Revision Guide
These are the notes I made for this topic.
They get at the most important parts of the topic
THEY ARE NOT a 1 STOP guide to the topic
They shouldn't be your only revision!!
Handwritten and Digital Notes Cambridge International AS and A Level Biology Students Coursebook
Handwritten and Digital Notes Cambridge International AS and A Level Biology Students Coursebook
All for this textbook (19)
Written for
A/AS Level
CIE
Biology
Unit 16 - P Selection and Evolution
All documents for this subject (9)
Seller
Follow
NenMedic
Content preview
🦍
Evolution
Class CMK
Created @May 6, 2020 11:23 PM
Materials
Reviewed
Type
Variation
Variation
Topics to cover
Variation
Genetic Basis
How else is allele frequency in a population changed?
Natural Seletion
The Darwin-Wallace theory of evolution by natural selection
Species and speciation
The Hardy-Weinberg principle
Artificial selection
Crop Improvements
Inbreeding and Hybridisation in Maize
Topics to cover
Variation
Enviormental Effects On The Phenotype
Natural Selection
Evolution 1
, Genetic Drift
The Hardy-Weinberg Principle
Artificial Selction
Crop Improvement
Inbreeding and Hybridisation in Maize
The Darwin-Wallace Theory of Evolution by Natural Selection
Species and Speciation
Allopatric Speciation
Sympatic Speciation
Molecular Comparison Between Species
Extinctions
Variation
What is Variation?
🦍 The differences in phenotype between individuals of the same or different
species
Sources of Variation
Independet Assortment of Chromosomes, and therefore alleles, during meiosis
During Metaphase 1 genes of alleles assort independently of one another
During Anaphase 1 these genes seperate
Hence gametes are varied
Evolution 2
, Crossing over between Chromatids of homologous chromosomes during
meiosis
When homologous chromosomes line up in metaphase 1 crossing over
between chromosomes mean there is an exchange of alleles.
Random Fertilisation of Gametes
Random mating between organisms in a species
Mutations
Random mutations in DNA cause mutations
What is Discontinuous Variation
Qualatative phenotypic variation
Seperated into clear categories with no intermediates
Individuals can be evenly or unevenly distributed between phenotypes
🦍 Little influence from the enviorment
Continuos Variation
Quantitative Phenotype
Character doesn't fall into clearly distinguishable categories
Covers a range with limits
Show normal distribution
Due to the interactions of many genes
Influence of the enviorment
Genetic Basis
Discontinuous
Evolution 3
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 NenMedic. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.11. You're not tied to anything after your purchase.
