Speciation Key terms - PRS

Adaptive radiation is

• when a small number of species form to occupy different ecological niche

• when a small number of species form to occupy the same ecological niche

• when a large number of species form to occupy different ecological niche

• when a large number of species form to occupy the same ecological niche

Allopatry means

• speciation as a result of different niches

• speciation as a result of geographical isolation

Tags

NGSS.HS-LS4-5

Analogous structures

• structures which have different jobs but have the same bone make up e.g. wings of a bird, bats or insect

• structures which have the same job and have the same bone make up e.g. wings of a bird, bats or insect

• structures which have the same job but have different bone make up e.g. wings of a bird, bats or insect

Tags

NGSS.MS-LS4-2

Cline

• a gradual variation in the characteristics of a species or community over a geographical range

• a gradual variation in the characteristics of a species or population over a geographical range

Co-evolution occurs

• when one species or group changes its genetic composition in response to a genetic change in another

• when different species living in the same environment come to look similar

• when one species branches to form two or three species

Divergent evolution occurs

• when one species or group changes its genetic composition in response to a genetic change in another

• when different species living in the same environment come to look similar

• when one species branches to form two or three species

Tags

NGSS.HS-LS4-5

Convergent evolution occurs

• when one species or group changes its genetic composition in response to a genetic change in another

• when different species living in the same environment come to look similar

• when one species branches to form two or three species

Tags

NGSS.HS-LS4-5

Embryology is

• the study of how embryos are affected by mutations

• the study of how embryos develop, looking at which genes are turned on and off.

Tags

NGSS.HS-LS1-4

NGSS.HS-LS3-2

Genetic drift is

• the important random fluctuation in the frequencies of alleles due to chance events

• slow changes between populations that occur as a result of different selection pressures

Homologous structures are

• structures that have the same job but have different bone make up e.g. wings of bats, dolphin flippers, and human arms

• structures that have a similar evolutionary history but have developed to suit different functions e.g. wings of bats, dolphin flippers, and human arms

Tags

NGSS.HS-LS4-1