Modern dogs are direct descendants of the gray wolf. They first appeared about 130,000 years ago. Today, there are about 150 different breeds of domestic dog. a few of which are shown below. 1. Gray wolf All modern domestic dogs are descendants of the gray wolf. adapted from: www.pba.org The great variety of modern dogs can best be explained by A. selective breeding of dogs over many years B. the cloning of domestic dogs C. genetic alterations in gray wolves alive today D. natural selection favoring wolves over dogs

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Genome annotation

The technique of linking biological information to genome sequences is termed genome annotation. Gene annotation is the method of identifying gene locations and coding sections. It helps us understand what these genes are doing in the body through establishing structural characteristics and linking them to the actions of various proteins.