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Water snakes are common in the area around Lake Erie. They live on the mainland as well as islands in the lake. The island and mainland populations are relatively isolated, but migration does occur. Interestingly, selection favors banded water snakes on the mainland and unbanded on the islands. Bandedness is […]

Based on human logic, if a parasite kills it’s host it is also harming itself. Tapeworms then appear to be “perfect parasites” because they cause very few symptoms in the host and are therefore able to shed eggs at will. But, diseases like antibiotic-resistant tuberculosis or viral cancers do kill […]

Ask quYour organs are wonderous things, each one with a different function vital to the homeostasis of your body. While it is easy for us to view a particular organ as a single item, it is in fact comprised of many different types of cells and structures, each one unique […]

An experimenter is studying a gene that codes for a very small polypeptide phe-his-gly-cys-gly. He treated the cells with different mutagens with the following results to the protein: Normal: phe-his-gly-cys-gly Treatment #1: phe-his-gly-cys Treatment #2: ser-his-gly-cys-gly Treatment #3: phe-his-arg-val-trp For each treatment, describe the exact mutagenic event (e.g. transition, transversion, […]