bio exam 3

certain traits that are more likely to acquire you a mate *intra- two males fighting for female *inter- female picks the male

physical feature differences between male and female of same species *peacock or cardinal

one species breaks into two species. lead to diversity of life

classification based on physical traits *only one the applies for FOSSILS

classification based on ecological niche

closeness in a phylogenetic tree. morphological and DNA sequence.

potentially interbreeding individuals that produce vital and fertile offspring. species in a gene pool that doesn’t exchange genes with other species

barriers that stop from mating

prezygotic -living in different habits, so can’t reproduce

prezygotic -species breeding during different seasons/times

prezygotic -failure to send/receive mating signals

prezygotic -reproductive parts don’t physically work together

prezygotic -incompatibility of egg and sperm

prevent development of viable and fertile offspring

offspring don’t develop properly and are very weak

offspring is healthy, but can’t reproduce

hybrid is viable and fertile, but its offspring are not

populations are geographically isolated -no gene flow -> reproductive iso.

a new species forming with a population already there

rapid evolution of diverse species from a common ancestor *one finch leads to many new species of finch’s

areas where different species meet and produce offspring

photosynthetic organism that released oxygen. increased O2 and enabled evolution of aerobic

eukaryotes obtained their organelles by engulfing prokaryotes

rapid evolution that created animals