And this specific type of test cross is known as a monohybrybrid test cross because we're basically crossing two heterozygous individuals for a given trade for the high trait. Now what he found out was that 75% of the time, or about 75% of the time, the individuals were tall, but 25% of the time the individuals were short. So let's actually confirm this by using the pundit square. So once again, one of the parents is uppercase T, lowercase T. And we know when we form the gametes, the law of segregation tells us that these two genes basically separate into individual cells, into individual gametes. So let's suppose this is parent number one. And so we have uppercase T here.