All 8 students started with Tt (red and green beads) they paired up and "reproduced" randomly. At the end of the first round, they had 4 T and 12 t. The recessive had dominated in random mating. Performing a bit of math that may have challenged a few, the numbers plugged into the Hardy-Weinberg equation and still arrived at 1.0
Second round, they reproduced similarly only this time the tt or recessive babies were eliminated and reproduction started again. The end of this round left only TT or dominant babies. Using the data still equaled 1.0
The final question about eliminating recessive allele was unanimously answered yes- survival of the fittest.
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