Natural selection is differential success in reproduction (unequal ability of individuals to survive and reproduce). Include these with your notes Darwin’s main ideas can be summarized in three points. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin CummingsĨ Darwin’s main ideas can be summarized in three points. Inference #3: This unequal ability of individuals to survive and reproduce will lead to a gradual change in a population, with favorable characteristics accumulating over the generations. Those individuals whose inherited characteristics best fit them to their environment are likely to leave more offspring than less fit individuals. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummingsħ Inference #2: Survival in the struggle for existence is not random, but depends in part on the hereditary constitution of the individuals. 22.9 Observation #5: Much of this variation is heritable. Observation #4: Individuals of a population vary extensively in their characteristics no two individuals are exactly alike. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin CummingsĦ Observation #5: Much of this variation is heritable. Inference #1: Production of more individuals than the environment can support leads to a struggle for existance among the individuals of a population, with only a fraction of the offspring surviving each generation. 22.8 Observation #3: Environmental resources are limited. Observation #2: Populations tend to remain stable in size, except for seasonal fluctuations. Observation #1: All species have such great potential fertility that their population size would increase exponentially if all individuals that are born reproduced successfully. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummingsĥ Observation #3: Environmental resources are limited. These observations include tremendous fecundity, stable populations sizes, limited environmental resources, variation among individuals, and heritability of some of this variation. 1 Natural selection-include these notes in your notebookģ In your hopefully stated the definition given for natural selection:Ĥ Ernst Mayr, an evolutionary biologist, has dissected the logic of Darwin’s theory of natural selection into three inferences based on five observations.
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