Natural Selection In Action

Question 0

Speciation is the:

Answer 0

Development of new species

Question 1

Natural selection is the process by which the?

Answer 1

Best-adapted organisms in a population survive, reproduce and pass on their alleles to their offspring

Question 2

Speciation happens when?

Answer 2

Populations of the same species become reproductively isolated

Caused by geographical isolation and natural selection

Question 3

Geographical isolation is when a?

Answer 3

Physical barrier divides a population of a species, e.g. Floods, volcanoes

Question 4

How does geographical isolation lead to speciation?

Answer 4

Conditions on either side of the barrier will be slightly different
Different environment on each side = different phenotype will become more common due to selective attention

Question 5

Natural selection occurs due to geographical isolation as:

Answer 5

Different adaptations = advantageous on each side, allele frequencies will change in each pop.
Mutations will take place independently in each pop. also changing the allele frequency
Change in allele frequencies will lead to changes in phenotype frequencies

Question 6

Geographical isolation eventually leads to?

Answer 6

Individuals from different pop. Will have changed so much that they won’t be able to breed with one another to produce fertile offspring: reproductively isolated

Question 7

Reproductive isolation is when:

Answer 7

changes in the alleles and phenotype of the 2 populations prevent them from successfully breeding together

Question 8

Reproductive isolation occurs in many ways:

Answer 8

Seasonal changes
Mechanical changes
Behavioural changes

Question 9

Seasonal changes is when individuals from the same population develop…

Answer 9

Different flowering or mating seasons or become sexually active at different times of the years

Question 10

Mechanical changes is:

Answer 10

Change in genitalia

Question 11

Behavioural changes is when:

Answer 11

Group of individuals develop courtship rituals that aren’t attractive to the main population

Question 12

A population doesn’t have to become geographically isolated to become reproductively isolated, random mutations could occur within a population resulting in the changes:

Answer 12

Preventing members of that population breeding with each other

Question 13

Speciation leads to:

Answer 13

Greater diversity

Question 14

Speciation leads to greater diversity as:

Answer 14

1) 1 pop. Become divided, new pop. Evolved into separate species
2) New species then divided again and new pops. Evolved into more separate species
3) Process repeated over a long period of time to create new species