Question

mendel crossed two plants that were heterozygous for the trait of flower color. which genotypes could he have used to represent the cross?
○ pp × pp
○ pp × pp
○ pp × pp
○ pp × pp

Explanation:

To solve this, we recall the definition of heterozygous: having two different alleles for a trait (e.g., \( P \) and \( p \)). Let's analyze each option:

• \( PP \times PP \): Both are homozygous dominant (same alleles), so not heterozygous.
• \( Pp \times Pp \): Both have \( P \) (dominant) and \( p \) (recessive) alleles, so they are heterozygous.
• \( pp \times pp \): Both are homozygous recessive, not heterozygous.
• \( Pp \times PP \): One is heterozygous (\( Pp \)), but the other (\( PP \)) is homozygous dominant, so the cross isn't between two heterozygous plants.

Answer:

B. \( Pp \times Pp \)