Interphase and Mitosis. Interphase is where the growth of the cell occurs, and it also tends to get various nutrients that it needs for growing. Mitosis is happens once the cell splits into two, and so on once the duplicated cells start to perform interphase once again.<span>distinct cells, often called "daughter cells".</span>
I think I understand even without the picture. I'll add a picture of the Punnett Square filled in, but what you're crossing is
Tt x tt (heterozygous crossed with a homozygous recessive)
The ratio you get in the end is 2 heterozygous (Tt) and 2 homozygous (tt) offspring, so the ratio is 1:1.
So the percentage of offspring that are homozygous recessive is 50%.