ANTB15H3 Chapter Notes -Stone Age, Adaptation, Speciation
Document Summary
Although single celled and lacking a nucleus, genetic comparisons suggest they are more closely related to eukaryotes than to bacteria. Incredible microbial diversity and new species never described before. These are master control genes that coordinate the activity of many other genes. Hox genes are found throughout the animal world. There are many ways in which genes can take on new functions. If it affects control regions, the protein may be made in a different place in the body or at a different time during an organism"s life. Following duplication, genes can be free to take on new functions. The human genome contains a staggering number of pseudogenes. A species is a group of animals or plants that are able to interbreed. Typically this happens when two populations become geographically separated. In fact, even simple genetic changes can create reproductive barriers. Typically such genes affect reproductive biology (usually in males) and are under selective pressure.
