Question

what would be the phenotypic ratio if two pink snapdragons (incomplete dominance) are crossed?
○ 1 red : 2 pink : 1 white
○ 2 red : 1 pink : 1 white
○ 3 red : 1 white
○ 4 pink, no other colors expressed

Explanation:

In incomplete dominance, the heterozygous phenotype is intermediate. Let the allele for red be \( R \) and for white be \( r \), so pink snapdragons have the genotype \( Rr \). Crossing two \( Rr \) (pink) snapdragons:

• Parent 1: \( Rr \) (gametes: \( R, r \))
• Parent 2: \( Rr \) (gametes: \( R, r \))

Using a Punnett square:

	\( R \)	\( r \)
\( r \)	\( Rr \) (pink)	\( rr \) (white)

The genotypes are \( 1 RR \), \( 2 Rr \), \( 1 rr \), so phenotypes are 1 red, 2 pink, 1 white.

Answer:

A. 1 red : 2 pink : 1 white