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...
Edexcel IGCSE Biology 復習筆記 2.6.2 Types of Respiration Aerobic Respiration Aerobic respiration requires oxygen It is defined as the chemical reaction in cells that uses oxygen to break down nutr...
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...
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...
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...
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 ...
Edexcel IGCSE Biology 復習筆記 2.6.1 Energy ATP Organisms need energy for things such as: Chemical reactions?to build larger molecules from smaller molecules Muscle contraction?to allow move...
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...
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...
