AQA A Level Biology复习笔记7.4.2 Abiotic & Biotic Factors
Abiotic & Biotic Conditions Niche The place where a species lives within an ecosystem is its?habitat The role that a species plays within its habitat is known as its?niche, including: Th...
AQA A Level Biology复习笔记7.3.8 Investigating the Effects of Random Sampling on Allele Frequencies
Practical Skill: Investigating the Effects of Random Sampling on Allele Frequencies Investigations to mimic the effects of?random sampling?on?allele frequencies?in a population can be devised using...
AQA A Level Biology复习笔记7.3.7 Types of Speciation
Allopatric & Sympatric Speciation Evolution?causes?speciation: the formation of?new species?from pre-existing species over time, as a result of?changes to gene pools?from generation to g...
AQA A Level Biology复习笔记7.3.6 Reproductive Separation
Reproductive Separation Reproductive separation In order for evolution to occur the new species population must be?genetically?and?reproductively separated?from the pre-existing species popu...
AQA A Level Biology复习笔记7.3.5 Evolution
Evolution The?allele frequencies?(within the gene pool) of a population can?change?over time due to processes such as natural selection When the?allele frequencies?of a population change?suf...
AQA A Level Biology复习笔记7.3.4 Types of Selection
Types of Selection & Their Effects Environmental factors that affect the chance of survival of an organism are referred to as?selection pressures For example, there could be high levels ...
AQA A Level Biology复习笔记7.3.3 Selective Advantage
Selective Advantage Every individual within a species population has the?potential to reproduce?and have offspring In reality, however, there are many?environmental factors?that?prevent?ever...
AQA A Level Biology复习笔记7.3.2 Natural Selection
Natural Selection Every individual within a species population has the?potential to reproduce?and have offspring which contribute to population growth If all the offspring of every individua...
AQA A Level Biology复习笔记7.2.3 Hardy-Weinberg
Natural Selection: Hardy-Weinberg Principle The Hardy-Weinberg principle states that if certain conditions are met then the?allele frequencies of a gene within a population will not change f...
