Micro Evolution

Question 1

Micro Evolution

Answer 1

The small-scale variation of allele frequencies within a species or population in which the descendent is of the same taxonomic group as the ancestor

Question 2

Five Fingers of Microevolution

Answer 2

Decrease in population size, non-random mating, mutation, gene flow, natural selection

Question 3

Microevolution - Decrease in Population Size

Answer 3

Can result in a loss of some alleles in the gene pool

Question 4

Microevolution - Non-Random Mating

Answer 4

Organisms may prefer to mate with others of the same genotype or of different genotypes. It won’t make allele frequencies in the population change by itself, though it can alter genotype frequencies

Question 5

Microevolution - Mutation

Answer 5

The original source of all genetic variation, results in changes to some of the alleles in the gene pool

Question 6

Microevolution - Gene Flow

Answer 6

The flow of genes into and out of a population through breeding with other populations

Question 7

Microevolution - Natural Selection

Answer 7

Those with traits more suitable to the environment are more likely to survive and reproduce than those less suited to the environment. This results in the more suited traits becoming more dominant in the population. It acts on individuals to produce changes in whole populations over time

Question 8

Diversifying (Disruptive) Natural Selection

Answer 8

Occurs when extreme values for a trait are favoured over the intermediate values

Question 9

Directional Selection

Answer 9

Occurs when individuals on one side of the mean in their population survive better or reproduce more than those on the other side of the mean

Question 10

Stabilising Selection

Answer 10

The population mean stabilises on a particular non-extreme trait value

Question 11

Founder Effect