BISC 102

broski's version from 2015-09-13 20:28


Question Answer
What is adaptationa TRAIT that helps an organism survive and reproduce
3 catagories of adaptationstructural, behavioural, physiological
Structural adaptationpart of the body that is designed to increase survival/reproductive success
examples of structural adaptationgiraffe neck, peacock feathers, anglerfish, cactus spines
Behavioural adaptationthe development of certain strategies organisms take to survive
examples of behavioural adaptationarcherfish spitting water, migrating geese, humans getting married
physiological adaptionsintrinsic change to physiology to better survive in environment
The main mechanism that leads to adaption isNATURAL SELECTION
natural selection isa PROCESS by which the individuals in a populating have the characteristics best suited to the environment to survive and reproduce
5 steps of evolutioncompetition, variation among individuals, heritable variation, selection, adaptation
Competitionspecies will compete to survive and reproduce
variation among individualsspecies vary, some are better at competing than others
heritable variationdifferences in the ability to compete can be genetically based
selectionindividuals and species with traits that result in higher survival, will have greater fitness
fitnessthe ability for a species or individual to reproduce and spread genes
The CHANGE in body size in the population over time is ___EVOLUTION
Three conditions necessary and sufficient for evolution by natural selectionvariation in the trait, variations must be heritable, variation has fitness consequences
3 constraints to evolutionevolution often has compromises (eg not too big not too small - avoid desireability to predators), constrained by history, and acts on existing variation

Recap of lecture 1

Question Answer
evolution is achange in a population
fitness is thenumber of progeny
natural selection is aprocess
adaption is atrait

Reading week 2

Question Answer
single celled organisms came to be whensmall organic compounds reacted to form amino acids, nitrogenous bases, and sugars. They further replicated into more complex structures.
how many amino acids are there?20
The theory of chemical evolution believed that life began as a molecule that existed by itself without being enclosed in amembrane
to make a copy of itself, the naked molecule had toprovide a template that could be copied, and catalyze polymerization reactions that would copy the template.
many believe the first life form was made ofRNA