So we have an individual that is given by uppercase uppercase B. And so the gametes produced by this individual, the sperm cells produced are uppercase B and uppercase B. Likewise, the Xcels produced by this individual a, lowercase B, lowercase upper B. So if we carry out this pun and square, we basically get uppercase B, lowercase B, uppercase B, lowercase B, uppercase B, lower case B, uppercase, lowercase B. So we see that all the possibilities are exactly the same. So what that means is our offspring for this particular mating process must be heterozygous.