Conservation of developmental genes in evolution is supported by all of the observations except that mutations of homeotic genes often have similar phenotypic effects in animals. almost all animals have the same homeobox genes expressed at equivalent anterior-posterior locations. mutations of homeotic genes often have significant, nonlethal phenotypic effects. tunicates have homeotic genes in distinct chromosomal locations from other animals.

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Immune Disorders

The collaboration between the cells and proteins that work together as a defense system against infection comprises the immune system.Each of them performs a variety of tasks to recognize and/or react against a foreign body.