Speciation

Gene cascade expression expression controls the

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Unformatted text preview: ls development of an animal from a fertilized egg egg 1 Localization of “head” mRNA “Head” mRNA Gradient of regulatory protein Homeotic genes • Control batteries of Control genes that shape anatomical parts such as antennae, legs and body segments segments Follicle cell protein signaling egg cell Gene expression Gradient of certain other proteins Body segments Larva Adult fly Key developmental genes are very ancient Homeotic genes contain nucleotide Homeotic sequences, called homeoboxes sequences, • That are very similar in many kinds of That organisms organisms Fly chromosome Genes that affect the Genes timing and rate of embryonic growth can greatly affect speciation speciation Fruit fly embryo (10 hours) Adult fruit fly Mouse chromosomes Mouse embryo (12 days) Adult mouse...
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This document was uploaded on 02/26/2014 for the course ENG 102 at Maryland.

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