Unit 4: Mechanisms of Evolution
Descent with Modification
explained the diversity of life by
from a common ancestor.
His ideas can be summarized in
inferences based on
Observation #2: Populations tend to remain
in size over
Observation #3: Resources are
Inference #1 (
for existence): There is a
among individuals of a population.
Observation #4: Members of a
in their characteristics.
Observation #5: Much of this
Inference #2 (
selection): Individuals whose inherited traits give them a high probability of surviving and
are likely to leave more
Inference #3 (
): A population will gradually accumulate favorable
over generations and become more
Humans have modified other species over generations by
and breeding individuals that possess desired traits. Darwin called this
Drug resistance in bacteria and viruses such as
are probably due to
for individual organisms that possess the resistance.
anatomical structures, such as the
among mammals, provide evidence of common
not visible in adults.
, related species tend to be found in the same
unrelated species that occupy similar ecological niches may look similar by
Darwin's theory of evolution predicts
forms during the evolution of species, and this is supported by
provide the latest support for Darwin's theory of evolution.
Mar 22, 2008