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BIOB50 lec 6 review
Question | Answer |
---|---|
Life history? | record of an organisms life events relating to growth reproduction development and survival |
3 characteristics of life history? | -age and size at sexual maturity -amount and timing of reproduction -survival and mortality rates |
life history strategy? | avgs of life history within a species. det.ed by how splits time and resources for growth reproduction and survival |
phenotypic plasticity? | organisms with the same genotypes may in different environments exhibit different traits/phenotypes |
morphs? | distinct forms created through phenotypic plasticity |
polyphenism? | when a single genotype has many morphs. |
asexual reproduction? what and who? | cell division, done by many protists and all prokaryotes. some multicellular organisms do both asexual and sexual reproduction. |
simple vs complex life cycle? | simple has no abrupt transitions, whereas complex have at least 2 distinct forms in which the body forms are different and the environment may be as well. |
metamorphisis | abrupt change from larvae to juvenile stage of life |
semelparous vs iteroparous | can reproduce once, can reproduce many times |
R vs K selection? | r- rapid devel. low invest, high pop growth, short life span k-slow growth, high parental invest, slow pop growth, long life span, low reprod rate,effic reprod favored. |
Stress? for plants | anythign that reduces vegetative growth |
Disturbance for plants? | anything that reduces biomass of plant in question |
propagules? | seeds/eggs |
when resources are primarily used on early reproduction what happens vs late reproduction? | reproduce at smaller size with less offspring |
what 3 factors did we learn about in class that affect how life cycles evolve? | competition, predation, environmental conditions |
dispersal vs parental investment? | both can help with stressful envs, one via anothers aid and the other via fleeing said env. and reducing comp with close relatives |
dormancy? | another way to cope with stressful envs via going into a state of suspended growth and development in which it's easier to survive |
TRUE/FALSE Dormancy is only seen in seeds, spores, eggs and embryos. | false, although best suited larger animals may enter dormancy as well. |
Niche shift | age or size dependant change in organism's function/habitat. |