act-dog

A computer simulation was run to study genetic drift (random fluctuations in allele frequencies) over several generations of 8 populations (P1−P8) of amoebas that reproduce asexually. Each amoeba in the initial generation (G0) of each population was homozygous for 1 of the alleles, Allele A or Allele B, of a specific gene. Each of 6 subsequent generations (G1−G6) was produced by randomly choosing half of the amoebas from the previous generation to reproduce. Figure 1 shows the frequency of Allele A in G0−G6 for each of P1−P4; Figure 2 shows the same for each of P5−P8. There were 10,000 amoebas in G0 of each of P1−P4; there were 12 amoebas in G0 of each of P5−P8. Figure 1 Key P1 P2 P3 P4 1.0 0.9 0.8 A 0.7 e l e ll 0.6 A f o 0.5 y c n e 0.4 uq e 0.3 rf 0.2 0.1 0.0 0 1 2 3 4 5 6 G Figure 2 Key P5 P6 P7 P8 1.0 0.9 0.8 A 0.7 e l e ll 0.6 A f o 0.5 y c n e 0.4 uq e rf 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 G Figures adapted from Teresa Audesirk et al., Biology: Life on Earth, 6th ed. ©2002 by Prentice-Hall, Inc.