Consider a gene with four alleles a1, a2, a3, and a4. if the cross a1a2 × a3a4 yields two offspring, what is the probability that both of them have the same genotype?

Possible genetic combinations of offspring are:

- A1A3
- A2A3
- A1A4
- A2A4


Therefore, each genotype has a probability of 1/4

The probability of having thesame genotype the second time is 1/4 * 1/4

= 1/16

The probability that both offsprings will have the same genotype is 1/16