18.5 isolation and speciation Flashcards Preview

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Flashcards in 18.5 isolation and speciation Deck (11):
1

population definition

group of individuals of one species that occupy the same habitat that can interbreed

2

alleles definition

different forms of the same gene

3

allelic frequency definition

number of times an allele occurs within the gene pool

4

gene pool definition

total number of all the alleles of all the genes of all the individuals within a particular population at a given time

5

speciation definition

evolution of new species from existing ones

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allopatric speciation definition

geographically isolated leading to the formation of a new species from existing ones

7

sympatric speciation definition

reproductively isolated leading to the formation of a new species

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how new species are formed by allopatric speciation

- Geographic(al) isolation;
- Separate gene pools between populations
- Variation due to mutation;
- Different selection pressures due to their different environments
- selected organisms survive and reproduce
- Leads to increase in allele frequency.

9

how new species are formed by sympatric speciation

- reproductive isolation
- separate gene pools between populations
- variation due to mutation
- different selection pressures due to their different feeding times (for example)
- selected organisms survive and reproduce
- leads to increase in allele frequency

10

what is adaptive radiation?

population becoming adapted to its local environment

11

species definition

group of individuals that can reproduce to produce fertile offspring