9B - Environmental Selection Pressure

Question 2

environmental pressures

Answer 2

factors in the environment that influence the survival and reproduction of a species ( predation, disease, competition, climate change)

Question 3

natural selection

Answer 3

process where individuals with advantageous phenotypes are more likely to survive, reproduce and pass their genes to the next gen

Question 4

conditions for natural selection

Answer 4

variation, selection pressure, selective advantage, heritabilty

Question 5

How do selection pressures affect genetic diversity and allele frequencies?

Answer 5

reduce genetic diversity by favoring advantageous alleles, which increase in frequency over generations.
Disadvantageous alleles decrease, frequency of advantageous alleles increases

Question 6

Why is genetic diversity important, and what happens if it’s low?

Answer 6

helps populations adapt to new selection pressures - increases survival chances.
Low diversity leads to difficulty adapting, increased inbreeding, and higher extinction risk.

Question 7

variation

Answer 7

Individuals in a population vary genetically, which leads to phenotypic differences

Question 8

selective pressures

Answer 8

environmental factors influence survival and reproductive success
- determines dis/advantageous traits

Question 9

selective advantage

Answer 9

better suited phenotypes overcome selective pressures - survive/reproduce

Question 10

heritability

Answer 10

advantageous traits must be genetically heritable to pass to offspring
- frequency of beneficial alleles increases overtime