Evolution May Lead To Speciation Flashcards
1
Q
what is the primary source of variation?
A
mutations
2
Q
what causes further genetic variation?
A
- meiosis
- random fertilisation of gametes
3
Q
what causes differences in survival and reproduction?
A
- predation
- disease
- competition
4
Q
what is a niche?
A
the role that a species has within the environment
5
Q
what is stabilising selection?
A
- this is when the intermediate phenotype is selected for
6
Q
what is directional selection?
A
- when one extreme phenotype is selected for
7
Q
what is disruptive selection?
A
- both extremes are selected for
8
Q
what are the types of selection?
A
- directional
- stabilising
- disruptive
9
Q
what is evolution?
A
change in allele frequencies in a population
