Samantha M. Hurndon Week 2

Aipotu IV: Evolution

• Part A: Population Genetics
  • We looked at Natural Selection in the absence of mutation
    • In the Evolution tab of Aipotu we first, disabled mutations.
    • Then we loaded red and white flowers from greenhouse and put them in our 'world' with a ratio of 50:50.
    • To make sure our ratio of accurate we counted the amount of red and white boxes, giving us 49 white and 51 red.
    • We then selected for for red by increasing the fitness to 10 and decreasing the fitness of all the others to 0.
      • A4.) We predict that the amount of red flowers will increase over several generations, and the amount of white flowers will decrease due to its much lower level of fitness in comparison to the red. Eventually, all the flowers will be red.
    • Our first cross gave us 72 reds and 28 whites.
    • Our third generation have us 8 whites and 92 reds
    • Our fourth generation is pure red.
      • A6.) If red generations are dominant and still produce white offspring, it could be due to some of the flowers still containing the white allele.

• Part B, Select for white
  • • After several generations, the flowers will all be white.
    • After one generation all the reds died off. This is because the white is recessive, therefore none of the whites carried a red allele. Opposed to the last experiment with red having a higher fitness, some of the reds were heterozygous, containing a white allele, therefore taking several generations for the whites to die off.

• Part C
  • • Here we selected for all reds in our world. We then clicked to show both allele colors, indicating that each flower had a red and a white allele. Genotype Rr.