Scientists sometimes make discoveries that lead to a need for new laws. This illustrates the general situation of science not just biology in pursuing scientific inquiry. Some of the classical experiments like the Mendel's crosses of the pea plant to understand the inheritance pattern of various observed traits required Mendel to come up with a hypothesis turned theory of independent assortment of genes. With substantial experimental trails on pea plants this theory turned into a law due to the increased number of supporting evidence.
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An individual must inherit two non-functioning CF genes — one from each parent — to have CF. If both parents are carriers there is a 1 in 4<span> (</span>25 percent<span>) chance that both will pass on the non-functioning gene, which would result in a pregnancy affected with cystic fibrosis.</span>
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As erosion removes the tops of mountains, the crust will rise upwards. This is an example of isostatic adjustment ( last choice).
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Organisms depend on many nonliving things in their environment, such as air, food, water, etc. If something were to happen to an organism's nonliving environment (ie a drought, fire, water contamination), the organisms would be severely affected.