BIO 2133 Quiz: Cambrian and Ordovician periods
25 Jun 2015
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Homeotic (patterned) genes produce transcription factors (how eukaryotes control their genome) In the developing embryo, when the egg is provisioned by the mother, she produces mrna which turns into proteins. As cells divide, cells anterior end get the blue transcription factor than the black and vice-versa, middle gets both. Homeotic genes regulate if cell is posterior, anterior or middle. Because of gradient, the cells genome is regulated differently depending on where it is. Everyone that the egg was homogenous (false) You can take cells and move them. Transcription factors can be moved within organism. Stable mechanism occurred that brought the simplest of organisms (ex. Regularity genes for pattern occur right after snowball earth. At the end of the ordovician, second largest mass extinction on face of planet. Trying to put an order on a collection of things. When the rule we use for classification, evolution relatedness.
