BIO 201 Lecture Notes - Lecture 11: Herbivore, Commensalism, Big Bang
23 Mar 2016
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Document Summary
One of the only well known examples of heterozygote advantage. Normal/sickle = in rare cases can have symptoms of anemia, resistant to malaria. Sickle/sickle/ = severe anemia, usually die at a young age. In areas where malaria is prevalent, normal/sickle genotype has the highest itness. This maintains the sickle allele in the populaion. N= populaion size t= ime r= net reproducive rate. Number of individuals that in a populaion can be supported in an environment indeinitely. The following term needs to be added: (k n)/k. K is the environment"s carrying capacity dn/dt = rn x (k- n)/k. As n approaches k, populaion growth sloes down and eventually remains a constant size. When resources are scarce, members of the same species (populaion) compete for them. Has strong efects of births and death rates of growth as discussed previously. One form common in sexually reproducive animals: sexual selecion. Populaion growth and dynamics are variable among species.
