And so because both of these are upper case B's, we have homozygous dominant. Now, likewise, we can also be homozygous recessive. And in this particular case, we have lowercase B, lower case B. And in this particular case, the individual will be colorblind because we have two recessive genes. Now, we can also be heterozygous. And that means one of them could be upper case B, the other one could be lower case B.