Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
root function
|
storage, anchorage, nutrient absorption
|
|
|
migration
|
increase allele variability w/n pop
decrease b/wn pop |
|
|
mutation
|
(genetics) any event that changes genetic structure
increase variability w/n pop b/wn pop depends on migration.... |
|
|
Genetic drift
|
the gradual changes in gene frequencies in a population due to random events.
decrease variability w/in pop increase variability b/wn pop |
|
|
Hybrid Zones (Possible outcomes)
|
Reinforcement, Fusion, Stability
|
|
|
Water quality measurements
|
Reduced:
- decreased dissolved O_2 -increase bacteria, nitrate, or phosphorus concentrations -decrease pH Good: -varied water speeds -woody debris -substrate variety - well-vegetated, stable banks |
|
|
schistosomiasis
|
small worm, small vector, Aswan Dam ->perfect habitat for vector
|
|
|
macroinvertebrates measure...
|
taxa richness
% EPT Biotic Index % filterers % predators |
|
|
N_2 Fixation
|
NH_4 from atm -> NO_2 -> NO_3
bacteria convert NH_4 to usable form for plants |
|
|
photoperiod
|
relative lengths of night and day
leaf perceives light red light most effective in interrupting photoperiodism *phytochrome is the pigment that detects red light |
|
|
ovule
|
structure w/ incipient seed coat and mature megagametophyte (includes egg)
|
|
|
sclerenchyma
|
fibres and scleroids
dead, thick, lignin, support and protection |
|
|
collenchyma
|
alive, variously thickened, support
|
|
|
parenchyma
|
alive, thin, photosynthesis, stores starch
|
|
|
sieve tube elements
|
elongated sclerenchyma in phloem tissue, transport carbohydrates.
|
|
|
genetic drift
|
-some individuals leave more genes
-totally random change in allele frequency -some die "lucky" ones can pass on their genes *amplitude of allele frequencies fluctuate from one generation to the next |
|
|
bottleneck effect
|
occurs when a pop undergoes a severe decrease in size
|
