speciation

Question 1

whats a species

Answer 1

a group of organisms that share structural and evolutionary features capable of interbreeding for fertile offspring

Question 2

speciation

Answer 2

formation of new species
as a result of isolation of parts of population

Question 3

process of isolating producing new species

Answer 3

two isolated populations have different surroundings
-natural selection acts differently on both
-genotype and phenotype of populations change
-to a point where cant interbreed

Question 4

hybridisation

Answer 4

two close species breed and make fertile offspring
-good and better adapted to niche
-dont produce fertile offspring with parent
can out compete parent plants

Question 5

reproductive isolation

Answer 5

new species formed from isolating populations
gene flow and mating restricted so new species formed

Question 6

geographical isolation

Answer 6

physical barrier like river or mountain to separate same species

Question 7

ecological isolation

Answer 7

two populations in same region but develop preferences for different parts of habitat

Question 8

seasonal isolation

Answer 8

timing of mating or flowering in some parts of population drift away from norm of group
same species reproduce months apart

Question 9

behavioural isolation

Answer 9

changes in courtship ritual or mating pattern
stops recognition between same species

Question 10

mechanical isolation

Answer 10

changes genetilia of animals
impossible to mate

Question 11

allopatric speciation

Answer 11

when populations are physically or geographically separated
main evolutionary process

Question 12

endemic species

Answer 12

when species evolves in geographical isolation and found in only one place

Question 13

adaptive radiation

Answer 13

when one species evolves quickly to make number of different species which all have different niches

Question 14

australian marsurpials and monotremes

Answer 14

marsurpials protect baby in pouches
monotremes lay eggs
-placental mammals dominate
marsurpials made lots of species when australia was joined with continents

Question 15

sympatric speciation

Answer 15

between populations of a species living in the same place that become matingly isolated by behavioural mechanical or seasonal changes
-gene flow continues

Question 16

whats different about sympatric species

Answer 16

closely related
occupy overlapping ranged
gene flow continues