QUICK REVISION 3052

Question 1

Gene pool

Answer 1

All the alleles (for a trait) in a population

Question 2

Directional selection

Answer 2

Selection favoring one particular extreme genotype

Question 3

Gene flow

Answer 3

Movement of alleles between gene pools by immigration and emigration

Question 4

Stabilising selection

Answer 4

Selection favouring the heterozygote

Question 5

Allele frequency

Answer 5

The proportion of an allele in a gene pool compared to that of the other alleles for that gene

Question 6

Genetic drift

Answer 6

Random change in allele frequency in small populations

Question 7

Deme

Answer 7

A local interbreeding population

Question 8

Disruptive selection

Answer 8

Selection favoring the two homozygous genotypes

Question 9

Natural selection

Answer 9

Process where certain genotypes produce more surviving offspring than other individuals, thereby making larger contribution to subsequent gene pools

Question 10

Mutation

Answer 10

The ultimate source of genetic variation in a population

Question 11

Evolution

Answer 11

Descent by modification

Question 12

Bottleneck

Answer 12

Period during which a population is greatly reduced to a very small number

Question 13

Cline

Answer 13

A gradual change in the trait of a species over a geographical gradient

Question 14

Founder effect

Answer 14

Reduction in genetic variation because of the seperating off of a small proportion from the larger population

Question 15

Polymorphism

Answer 15

The presence of two or more distinct variants in a population

Question 16

Species

Answer 16

A group of interbreeding or potentially interbreeding organisms