BIOL 201 Lecture Notes - Lecture 3: Chlorophyll, Holdfast, Diatomaceous Earth
23 Apr 2018
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Mechanisms of genetic variation within populations that provide the basis for evolution by natural selection: If environment is constant and not changing or the genotype is well adapted to the environment there is no reason for diversity to change. Sexual reproduction can take up a lot of energy (pollen production, pollinators etc) There has to be a partner in sexual reproduction but there might not be one available. Nursing effects does(cid:374)"t have to ger(cid:373)i(cid:374)ate or put out a root, its root syste(cid:373) is (cid:272)o(cid:374)(cid:374)e(cid:272)ted (cid:271)y the same plant. Each reproduction event enhanced genetic diversity among population within a species. Mitosis: daughter"s cells have identical genotype to original cell and same number of chromosome pairs. Meiosis: homologous chromosomes synapse, some chromatid sections cross-over (genetic recombination) and the resulting pairs are separated into four genetically different haploid cells (gametes or spores) Hybridisation the act or process of mating organisms of different varieties or species to create a hybrid.
