Fill in the Blanks 248-testOnline version 248-test by Farhad Key 1 contrast As affect symmetry control embryonic how of have Recently , research into development has given us an even better insight into major structural changes might occur in a given population of organisms . We now understand that there are two major types genes : developmental and " housekeeping " genes . Developmental genes are those that are expressed during embryonic development , and their proteins the , skeletal development , organ placement , and overall form of the developing animal . In , " housekeeping " genes are expressed during the animal's daily life to generate proteins which keep the cells , tissues , and organs in the body functioning properly . you might suspect , mutations in developmental genes can radical consequences for body form and function , whereas mutations in " housekeeping " genes tend to the health and reproductive success of the post - embryonic animal .
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