A tall pea plant (Tt) is crossbred with a short pea plant (tt). The following Punnett square shows the separated alleles for two pea plants.
Punnett square showing female parent across the top with a phenotype of tall and a genotype of Tt and a male parent across the side with a phenotype of short and a genotype of tt. Inside the top left box 1 is written, inside the top right box 2 is written, inside the bottom left box 3 is written, inside the bottom right box 4 is written.
Which of the following shows the correct match of the box numbers and the genotype of the offspring?
The answer is the first one. For one and three, the "T" from the mother is crossing with a "t" from the father. On two and four, both of their "t"s are crossing and that's why those are both tt. So, your answer is the first one.
