Assume that genes C and D are not linked. If the probability of allele C in a gamete is 1/4 and the probability of allele D in a gamete is 3/4, then what is the probability that both C and D are in the same gamete?
1) 1/4 + 3/4
2) 1/4 * 3/4
3) |1/4 - 3/4|
4) 1/4 ^ 3/4