Question

a plant can produce either purple flowers or white flowers. the purple flower color is dominant over the white flower color. what is the ratio of the offspring with purple flowers to the total number of offspring if two plants that are heterozygous for purple flowers are crossed?
○ 1:4
○ 2:4
○ 3:4
○ 4:4

Explanation:

Step1: Define Genotypes

Let \( P \) be dominant (purple), \( p \) recessive (white). Heterozygous plants: \( Pp \).

Step2: Set Up Punnett Square

Cross \( Pp \times Pp \). Gametes: \( P, p \) from each.

	\( P \)	\( p \)
\( p \)	\( Pp \)	\( pp \)

Step3: Determine Phenotypes

• \( PP, Pp, Pp \): purple (3 cases).
• \( pp \): white (1 case). Total offspring: 4.

Step4: Calculate Ratio

Purple offspring: 3, total: 4. Ratio: \( 3:4 \).

Answer:

3:4 (corresponding to the option with 3:4, e.g., if options are labeled, the one with "3:4")