Start with a completely heterozygous population. How does the introduction of a mutant change the population composition over time? Try this experiment with different environmental conditions. Start with a completely homozygous recessive population. How does the presence or absence of predators affect the changes in the population?ĭoes the initial composition of the population influence its genetic composition 100 generations later? THINGS TO TRY homozygous dominant, heterozygous, homozygous dominant individuals) changes under different environmental conditions. Observe how the changes in the population composition (i.e. The predation probability reduces depending on how well a mouse camouflages, based on its fur coat color and the color of surroundings. If PREDATION? is ON, CHANCE-OF-PREDATION can be adjusted from 0 to 0.50.ĬHANCE-OF-PREDATION determines the probability of a mouse dying from predation in each generation. PREDATION? is a chooser that can be ON or OFF. Watch the monitors and plot below the initial settings and make observations about this data.Press the GO button to watch the generations advance indefinitely until stopped. Press the GO-ONCE button to advance the generations once at a time. Adjust the CHANCE-OF-PREDATION slider if PREDATION? is on.Make sure the PREDATION? switch is in the preferred setting. Press the SETUP button and then select a background by pressing the SET-LIGHT-BACKGROUND, SET-DARK-BACKGROUND, or SET-MIXED-BACKGROUND button.INITIAL-HOMOZYGOUS-RECESSIVE-FEMALES ( aa females).INITIAL-HETEROZYGOUS-FEMALES ( Aa or aA females).INITIAL-HOMOZYGOUS-DOMINANT-FEMALES ( AA females).INITIAL-HETEROZYGOUS-MALES ( Aaor aA males).INITIAL-HOMOZYGOUS-DOMINANT-MALES ( AA males).First, set the initial population by adjusting the following sliders:.For simplicity, there are no overlapping generations. Each child receives one of the alleles from its mother and one of its alleles from the father. Inheritance of the fur coat color genes is modeled based on the laws of Mendelian inheritance.Įach mating pair produces four children.
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