Biology 1001A Lecture Notes - Lecture 15: Asexual Reproduction, Parental Investment, Limiting Factor
14 Dec 2015
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Ecological explanations for sex: in some environment, individuals benefit from sex. If environment never changes, and reproduced, then alive and good reproductive success. If environment changes, then its good idea to clone yourself (by reproducing) Asexual reproduction usually occurs when environment doesn"t change. Environment changing offspring encounter experience diff environmental pressures than parents so good idea to make few offspring at a time, so babies can adapt to environment since it is unpredictable. Foolish to make same offspring, so make diversity of offspring = sexual reproduction. Depending on environment, individual may increase its reproductive success by reproducing sexually. Creates offspring genotype that is diff from e. o and parents. Red queen and evolutionary change: it takes all the running you can do, to stay in the same place . Diseases invent new keys; hosts change the locks . Species around you (viruses, fungal diseases, parasites) are constantly evolving and getting better and better at overcoming your immune system.
