Final 2015 :) Flashcards
Why is meiosis significant?
To create genetic variance
Meselson-Stahl
DNA is semiconservative
Homology
features coming from the same ancestor
Founder effect
creates a new population from ISOLATION
Bottleneck Effect
new population from REDUCTION of alleles; pop is wiped out, one specific trait is left
Directional
Going to one extreme or another- REDUCES DIVERSITY
Stabilizing
Extremes are eliminated ex. average sized babies are most likely to survive
Disruptive
Eliminates middle section- ex. birds with either short or long beaks are likely to survive
Morphospecies
structural similarities in a species
Phylogenic
Phylogenic trees
Why are there seasons?
The Earth’s tilt
Imprinting
Learning from parents- birds singing
Thinking
Unsure if animals are able to think or not
Survivorship curve I
Start dying out at old age
Survivorship curve II
mortality isn’t dependent on age (straight downwards line)
Survivorship curve III
Juvenile mortality is high- laying lots of eggs, many don’t survive
Basidian mimicry
harmless imitates harmful
Mullerian mimicry
2 harmful imitate each other to better their survival
Mark-recapture technique
Mark caught animals, come back the next day, do the same thing; you will have animals that have already been marked
Mark-recapture equation
(# marked x total caught) / # mark recaptured
Immigration is higher on…
Close islands (easier to move)
Extinction is higher on…
Small islands (less resources)
Competitive exclusion principle
if two species are competing for the same prey, one will eventually become extinct
Biological magnification
certain substances work their way through the food chain such as pesticides, chemicals, etc.
