BIOL 1020U Lecture 2: CH 21_Evolution WF Notes
Document Summary
Adaptation, unity and diversity: three key observations about life, organisms suited to their environments- adaptations, shared characteristics (unity, rich diversity. Grasshopper: camouflage: camouflage is often a dramatic example of adaptation. Headstander beetle: ability to obtain water -uses water droplets in fog. It depends on the differential success, in terms of surviving and reproducing, of variants. Humans high degree of phenotypic variation, but we actually rank low in terms of overall genetic variation compared to other species. Is about 10 times more variable than we are in terms of the number of. Dna bases that differ from one individual to the next. Low degree of phenotypic variation but are actually 2- 3 times more genetically variable than we are! Population genetics is the study of patterns of genetic variation in natural populations. Species a group of individuals that can exchange genetic material through interbreeding, or share alleles through reproduction. Gene pool all the alleles present in all individuals in a species.
