3.7.3 speciation

Question 1

natural selection

Answer 1

the process which leads to evolution, resulting in species becoming better adapted to the environment

Question 2

what is a selection pressure

Answer 2

factors which affect the survival of an organism, leading to natural selection

Question 3

what is differential reproductive success

Answer 3

not all individuals are equally likely to reproduce, resulting in changes to allele frequencies within the gene pool

Question 4

allele frequency

Answer 4

proportion of an allele in the population

Question 5

disruptive selection

Answer 5

individuals with either extreme trait are more likely to survive and pass on their alleles, the middle trait becomes less frequent, leading to speciation

Question 6

what is isolation

Answer 6

the process that results in the creation of a new species

Question 7

allopatric speciation

Answer 7

two populations being geographically isolated, resulting in the formation of a new species

Question 8

sympatric speciation

Answer 8

two populations being reproductively isolated whilst in the same location

Question 9

reproductive isolation

Answer 9

two populations of the same species but they can not breed together, so there is no gene flow

Question 10

genetic drift

Answer 10

change in allele frequency within a population between generations over generations