Biology - Principles of Inheritance and Variation Question with Solution | TestHub

In pea plants, the allele for tallness ($T$) is dominant over dwarfness ($t$), and the allele for round seeds ($R$) is dominant over wrinkled seeds ($r$).

For a plant to be tall with round seeds, its genotype must contain at least one dominant allele for both traits, which means it must be of the form $T\_R\_$.

Analyzing the given genotypes:
$TTrr$: Tall, wrinkled
$Ttrr$: Tall, wrinkled
$TtRr$: Tall, round
$TTRr$: Tall, round
$ttrr$: Dwarf, wrinkled
$TtRR$: Tall, round

There are three genotypes ($TtRr$, $TTRr$, and $TtRR$) that represent tall plants with round seeds.

Answer: Three