BIO152H5 Study Guide - Midterm Guide: Nitrogenous Base, Chromosome, Hydrophile

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A hypothesis must be testable and falsifiable. A theory is a well tested explanation for a more general phenomenon; hypothesis treat more specific observations. Heritable variation is the variation in characteristics caused by genetic factors. E. g. of heritable variation would be a disease (like skin cancer, etc) or eye colour. The first meiotic division results in halving the amt of dna in the cell. In mitosis, the number of chromosomes in the cell remain the same before and after mitosis. Speciation: genetic isolation, genetic drift and/or natural selection, divergence to two species. Speciation is the evolutionary process by which new biological species arise. Postzygotic isolation - a type of reproductive isolation that occurs after members of two different species have mated and produced a hybrid offspring. Cell cycle: interphase [ g1 (first gap), s-phase (synthesis), g2 (second gap)], For many cells, this phase is the major period of cell growth during its lifespan.

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