BIOL 3040 Chapter : CH 1 Learning Objectives
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The mutations can increase, decrease or have no effect on the fitness. Fitness is measure in terms of relative survival rates and reproductive success: for example, the evolution of antibiotic resistant bacteria. Antibiotic resistance is the result of natural selection. Bacteria can evolve very rapidly, and when exposed to antibiotics, that"s exactly what they do. By gaining resistance an organism is better able to survive. The extinction of the two species b and. C results in the loss of a major branch of the phylogenetic tree. If we are interested in conserving phylogenetic diversity the loss of species b and c is a greater loss. In most species, a single male can fertilize numerous females so why could there not be an excess of females: answer: mechanics of our chromosomal sex determination, females have two x chromosomes. Males have an x and y chromosome; during meiosis, these segregate evenly to produce.
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