evolution of species 0.0 / 5 ? BiologyEvolution, extinction and natural selectionNational 5SQA Created by: urghexamsCreated on: 15-12-18 10:35 what is a mutation a random change to genetic material 1 of 13 what is the source of new alleles spontaneous mutations 2 of 13 mutations can be neutral, advantageous, disadvantageous 3 of 13 what can increase the rate of mutation radiation and some chemicals 4 of 13 why can alleles lead to animals being better adapted to their surroundings because they lead to adaptations, variation in a population allows them to evolve over time 5 of 13 when does natural selection occur when there are selection pressures 6 of 13 what happens in natural selection the best adapted survives, passing on favourable alleles that confer the selective advantage 7 of 13 what is speciation the process in which a new species is formed 8 of 13 when does speciation occur when population is isolated by a isolation barrier 9 of 13 what are the isolation barriers geographical, ecological and behavioural 10 of 13 what happens after part of a population is separated by an isolation barrier different mutations occur in each sub population , leading to variation which is not shred between groups 11 of 13 what happens after random mutations take place in each group natural selection selects for different mutations due to different selection pressure in each group 12 of 13 what happens after natural selection in speciation over time, the two groups gene pools continue to be altered and a new species is evolved 13 of 13
Comments
No comments have yet been made