1 If you're under 16, it can helpful to bring along a parent or guardian for the initial interview with the people seeking babysitting. 2  This reassures the other parents that your own parents are invested in your success and that you mean business, and it also protects you.
Evolutionary biology. Fitness (often denoted w {\displaystyle w} or Ï in population genetics models) is the quantitative representation of natural and sexual selection within evolutionary biology. It can be defined either with respect to a genotype or to a phenotype in a given environment.
Describe how adaptive traits increase the fitness of individuals in a particular environment. Adaptive traits increase in frequency because they enhance individual survival and reproduction of individuals in a population. Biological fitness is measured by the proportion of genes compared with all the genes in population. Traits are often a trade-off between survival and reproduction, so that natural selection optimizes the evolution of traits that allow survival while maximizing reproductive success.