Ecology

Question 1

Allopatric speciation?

Answer 1

geographic isolation leads to speciation

Question 2

Sympatric speciation?

Answer 2

No physical barriers but new species with diff food source/chara develop spontaneously

Question 3

Mutation?

Answer 3

Mistake in DNA replication causing gene variation

Question 4

Recombination?

Answer 4

Sexually producing population, new gene combination produced by meiosis/fertilisation

Question 5

Members of same species show variation? (T/F)

Answer 5

True

Question 6

Evolution?

Answer 6

Change which gives rise to new species. Organism better suited to environment.

Question 7

Darwinism vs Neo-Darwinism?

Answer 7

Darwinism focuses on phenotypic variations (Traits) & natural selection as driving force for evolution while Neo-Darwinism includes genetic variations, mutations & genetic drift along with natural selection as driving force.

Question 8

Genetic drift?

Answer 8

Random change in gene frequencies due to chance events - migration, isolation or population size fluctuations.

Question 9

Which mass extinction currently in progress?

Answer 9

6th mass extinction (Anthropogenic Extinction)

Question 10

Order of mass extinctions

Answer 10

Ordovician - Silurian, Devonian, Permian - Triassic, Triassic - Jurassic, Cretaceous - Tertiary, Anthropocene/Holocene

Question 11

Largest mass extinction?

Answer 11

Permian - Triassic (250 mn yrs ago)

Question 12

Cretaceous - Tertiary ?

Answer 12

Wiped out dinosaurs & 50% plants & animals.