19.2- Causes of Gene pool change

Question 1

Mutations lead to ___

Answer 1

New alleles in the gene pool

Question 2

Some mutations may result in ____

Answer 2

a selective advantage

Question 3

Gene flow=

Answer 3

Net movement of alleles from one population to another

Question 4

Migration of individuals results in ____

Answer 4

Gene flow

Question 5

Gene flow reduces____

Answer 5

Genetic differences between populations

Question 6

Non random mating=

Answer 6

selective individuals have a better chance of mating than others

Question 7

Genetic drift is likely to affect___

Answer 7

small populations

Question 8

Genetic drift=

Answer 8

Change in alleles frequency due to chance events

Question 9

Founder effect occurs when ____

Answer 9

a new isolated population developed from a small number of individuals

Question 10

The bottleneck effect occurs when ___

Answer 10

there’s a rapid decrease in population size and only a few individuals are left to pass on genes

Question 11

Bottleneck effect is caused by ___ ____ ____ ____ etc

Answer 11

disease
humans
natural selection
starvation

Question 12

Natural selection=

Answer 12

organisms that survive to pass on genes, increasing allele frequencies

Question 13

sexual selection results from ___

Answer 13

Non- random mating

Question 14

sexual selection=

Answer 14

species mate with individuals having a particular trait

Question 15

Heterozygote advantage=

Answer 15

individuals carrying one copy of each allele have a survival advantage over either form of homozygotes

Question 16

Habitat fragmentation=

Answer 16

large continuous habitats are split due to human (eg building roads)

Question 17

Habitat fragmentation prevents____

Answer 17

gene flow between populations

Question 18

bottleneck effects can be caused by ___

Answer 18

Habitat destruction