CPT Part 2 Flashcards
1
Q
Natural Selection
A
Change that happens over many generations when individuals survive and pass their alleles on to offspring
- must be diversity within a species, otherwise none would survive
2
Q
Stabilizing Selection
A
- Natural selection that favours average pheotypes, doesn’t like extreme variations
- Reduces variaiton, improves adaptation of population to aspects of env. that remain constant
- ex. human baby size/weight
3
Q
Directional Selection
A
- Natural selection that favours phenotypes of one extreme over the other, or the average.
- Common during changes of the living env.
4
Q
Disruptive Selection
A
- Natural selection that favours the extremes of a range of phenotypes rather than the average.
- No more average. Either extremely A trait or extremely B trait.
5
Q
Sexual Selection
A
- Natural selection based on mating; female picks the best and most “fit” mate
6
Q
Behavioral Isolating Mechanism
PRE ZYGOTIC
A
- Behavior or routine that stops a species from breeding
- EX. Bird species having different mating calls
7
Q
Habitat Isolating Mechanism
PRE ZYGOTIC
A
- When two species live in different habitats in the same general area
- Physically blocked from interacting
- EX. Fish and land bugs
8
Q
Temporal Isolating Mechanisms
PRE ZYGOTIC
A
- When species mate at different times or parts of the year, limiting interaction
- EX. tulips bloom in spring, roses bloom in mid summer
9
Q
Mechanical Isolating Mechanism
PRE ZYGOTIC
A
- Closely related species who’s genital anatomy are phycially incompatible
- Common in insects
10
Q
Gametic Isolating Mechanism
PRE ZYGOTIC
A
- Gamete is not able to survive in the harsh env. of the female’s reproductive tract
11
Q
Hybrid Inviability
POST ZYGOTIC
A
- Genetic info is not compatible within the species
- Zygote is not able to undergo mitosis
12
Q
Hybrid Sterility
A
- When two species can mate & produce viable offspring
- Offspring are sterile, cannot do meiosis
13
Q
Hybrid Breakdown
A
- Two organisms are able to mate and produce viable & fertile offspring
- When hybrid offspring mate, their offspring are sterile & weak
