Grade achieved: A*
I have put so much hard work into making this set of notes. Achieving grade A* and constantly getting top grades at school proved that my hard work paid off.
My notes are mostly based on 10+ years of mark schemes from past papers, and some from revision guides + online res...
AQA AL Biology notes Topic 7 – Genetics, populations, evolution and ecosystems
Topic 7 – Genetics, populations, evolution and ecosystems
Table of Content
7.1 Inheritance...................................................................................2
7.2 Populations..................................................................................5
7.3 Evolution may lead to speciation..................................................6
7.4 Ecosystem.....................................................................................8
1
, AQA AL Biology notes Topic 7 – Genetics, populations, evolution and ecosystems
7.1 Inheritance
Genotype
Genetic constitution of an organism
Eg BB, Bb, bb (eye colour)
Phenotype
Expression due to genotype and environment
Eg brown eyes
Explains why genetically identical twins may have diverging phenotypes, esp. as get older & are
exposed to more environmental stimuli
Allele
Different version of a gene (sequence of bases different)
In a diploid organism, alleles at specific locus may be either
o Homozygous
Both alleles at specific locus on each homologous chromosome are the same
Eg BB or bb
o Heterozygous
Both alleles at specific locus on each homologous chromosome are different
Eg Bb
Alleles may be…
o Dominant
In heterozygous state, it's the allele that is always expressed (in phenotype)
o Recessive
In heterozygous state, it's the allele that isn't expressed in phenotype
Only expressed if homozygous recessive or absence of dominate
o Codominant
Both alleles are expressed (in phenotype)
2
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 acer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.09. You're not tied to anything after your purchase.
