Evolution

Question 1

Directional

Answer 1

Form of selection that results in a progressive shift in a population’s mean value for a trait.

Question 2

Disruptive

Answer 2

Form of selection that results in a population being split into two distinct groups, each with its own mean value for a trait.

Question 3

Evolution

Answer 3

Process of gradual change in a population of organisms over successive generations resulting from genomic variations.

Question 4

Allopatric

Answer 4

Form of speciation where gene flow between populations of a species is prevented by a geographical barrier.

Question 5

Gene pool

Answer 5

Total of all the genomic sequences (alleles) present in the genotypes of the members of a species.

Question 6

Isolating mechanism

Answer 6

Geographical, ecological or behavioural barrier that prevents genetic exchange between populations of a species.

Question 7

Neutral

Answer 7

Type of mutation whose genetic sequence differs from the original but which still codes for the functional protein.

Question 8

Selective advantage

Answer 8

Benefit gained by mutant organisms in an environment that suits them but not other members of the population.

Question 9

Speciation

Answer 9

Generation of new biological species by evolution as a result of isolation, mutation and natural selection.

Question 10

Species

Answer 10

Group of organisms that produce fertile offspring and share the same chromosome complement.

Question 11

Sympatric

Answer 11

Form of speciation where gene flow between populations of a species is prevented by a behavioural or ecological barrier.