BIOA01H3 Lecture Notes - Genetic Drift, Allele Frequency, Sickle-Cell Disease
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BIOA01H3 Full Course Notes
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Depends on the environment, selection will occur to see who lives. Survival is one thing, whether or not they can survive long enough to reproduce is another. They must attract mates to fertilize (females pick males) Females choose, males must adapt to attract the ladies w/o these adaptations, the males may not attract the females, and therefore not reproduce and not creating off springs to carry on that trait. Lions: darker = higher testosterone = higher sperm count = stronger = healthier = longer life = sexier lion = better reproduction success. Death-causing sickle cell trait, in heterozygous form, will have defense from malaria. Thus, it"ll keep that trait there as an advantageous trait. With resources, they can survive and reproduce; victorious traits will be passed onto offspring and possibly the entire species. Evolution: shift in allele frequencies in a population. Genetic difference occurs with genetic variation through mutations. For evolution to occur, there must be genetic variation.