Home > Biology and the Tree of Life > Summary Review
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Robert Hooke. Lorenzo Oken. Anton van Leeuwenhoek.
All living organisms are made of cells. All living organisms are multicellular. Cells arise from preexisting cells.
cells grow in broth unless the broth is sealed off from the air. cells would not grow in the sterile environment inside the flask. bacteria, but not fungi, can grow in broth. cells can grow in broth after it has been boiled.
excluded preexisting cells after boiling. supported both the spontaneous generation hypothesis and the "all cells from cells" hypothesis. rejected the "all cells from cells hypothesis"the hypothesis that cells arise only from pre-existing cells. rejected the spontaneous generation hypothesis.
species remain unchanged over time. no traits are heritable. many species arose independently. all species are descended from a common ancestor.
The population must be large for natural selection to occur. Individuals within a population vary in their characteristics. Random mating must occur. Humans select which individuals mate.
Variation within a population is heritable. Certain heritable traits help individuals to better survive and reproduce. Individuals vary within a population. Humans can affect evolution through artificial selection.
kale brussels sprouts cabbage broccoli all of the above broccoli and brussels sprouts
genus; species species; family genus; order family; genus
Homo habilis Primates Homo sapiens Hominidae homo
Monera only Monera and Protista Archaea and Eukarya Fungi and Monera
Archaea and Eukarya Archaea only Bacteria only Archaea and Bacteria
the sequences are similar in closely related organisms and less similar in less closely related organisms. not all organisms have ssuRNA, indicating that organisms with ssuRNA are closely related. the sequences vary widely among all organisms. the sequences clearly indicate where lineages of organisms belong on the tree of life.
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
Experiments are repeated on many individuals (large sample size). Treatments, including experimental groups and controls, are randomized during experimentation. A control group is included. All are important.