difference in phenotypes between organisms of same species
some phenotypic variation is by genetic factors:
such as blood groups an individual has two alleles of three possible ones (ABO)
some phenotypic variation by environmental factors
such as plants having same gene but will grow to different heights depending on the conditions of environment
phenotypic variation can be also by combination of genetic and environmental
genetic variation
small differences in DNA base sequences between individual organisms
The phenotypic variation of the individuals in a population is determined by the genetic variation within the population and the interaction of the environment on the individuals:
The production of different combinations of alleles in daughter cells due to the random alignment of homologous pairs along the equator of the spindle during metaphase I
The process by which individuals with a fitter phenotype are more likely to survive and pass on their alleles to their offspring so that the advantageous alleles increase in frequency over time and generations