I haven't been able to figure out how to put a decent Punnett Square on these forums. The pastel produces two types of gametes (P s and p s), and the bumble bee produces four types of gametes (P S, p S, P s, and p s. S = spider, s = normal, P = pastel, and p = normal). This makes a 4x2 grid:
PP Ss | Pp Ss
Pp Ss | pp Ss
PP ss | Pp ss
Pp ss | pp ss

Result:
1/8 PP Ss = killer bee
1/8 PP ss = super pastel
2/8 Pp Ss = bumblebee
2/8 Pp ss = pastel
1/8 pp Ss = spider
1/8 pp ss = normal

In my opinion, the branching system is better than the Punnett Square for two or more loci. I can do a branching system with pencil and paper in half the time and with fewer mistakes than a Punnett Square. But a branching system is harder to do on these forums than a Punnett Square.

Paul Hollander

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