Biology 1201A Lecture Notes - Lecture 4: Meristem, Peptide, Advantageous
4 Oct 2017
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Microevolution- changes in frequencies of alleles or heritable phenotypic variants in a population over time. Population- all the individuals of a single species that live together in the same place and time. Phenotypic variation- the differences in appearance or function among individuals of a population. If a difference is heritable, it is passed from generation to generation. Darwin"s theory recognized the importance of heritable phenotypic variation. Quantitative variation- individuals differ in small incremental ways. Measuring height, number of hairs on the head or weight within a class: natural selection often changes the mean value of a character or its variability within populations. Qualitative variation- they exist in two or more discrete states, and intermediate forms are often absent. Phenotypic variation within populations may be caused by genetic differences between individuals: differences within the environment that the individuals experience. Interaction between an individual"s genetics and the environment; which leads to genetic and phenotypic variations not perfectly correlated: ex.
