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Flashcards in Natural Selection Deck (16)
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1

Genetic Drift

-Random
-a major short term cause of change in alleles
-random change due to sampling error
-depends on population size= inverse relationship
-bottleneck
-eventually causes loss in genetic variation
-founder effect

2

founder effect

-a few disperse to another area and are the founders
-type of genetic drift

3

spatial subdivision

patchy food, nesting sites, or other habitat features

4

Gene Flow

-movement of individuals or gametes between subpopulations
-migration
-keep populations from becoming different from each other genetically
-counteracts genetic drift

5

Local gene flow

slows down rate of adaptation

6

Global gene flow

speeds up rate of adaptation

7

characteristics of NON evolving population

-no net mutations
-population large:no genetic drift
-population isolated: no gene flow
-mating is random
-no natural selection

8

Natural Selection

-adaptive changes
-allows organisms to track changes in local environments

9

adaption

process where a characteristic is improved for specific function

10

3 conditions for Natural Selection

-phenotypic variation
-fitness differences
-underlying genetic variation

11

fittness

measure of relative reproductive success

12

w=

fittness

13

juvenilization

keeping pup characteristics

14

pleitropy

where a single gene simultaneously affect multiple traits

15

duplications

important in the evolution of gene families

16

prevent natural selection

all phenotypic variation is caused by environment