Answer:
D. Dominant gene is the correct answer.
Step-by-step explanation:
a capital letter, such as T represent Dominant gene in a Punnett square.
A dominant gene is a fragment of DNA information which is used to produce chromosomes.
When a gene is dominant it is expressed.
The Punnett square used for prediction the genotypes of a specific breeding test.
In a Punnett square dominant gene is represented by a capital letter(T) and the recessive gene is represented by the lower letter(t).