Question

Both Parent Plant 1 and Parent Plant 2 have flowers that are pink. Each has a dominant Red allele and a dominant White allele. Neither allele alone can produce enough pigment to be either white or red, so the flowers are pink. Complete the Punnett Square to answer the questions.

The Punnett Square shows the possible results for which of the following inheritance patterns?

R W

W WR
R

Incomplete dominance

Recessive

Dominant

Sex-Linked

Answer 1

Answer: Incomplete dominance.

Explanation and completed Punnett square:
- Parent genotypes: RW (pink) x RW (pink)
- Gametes: R and W from each parent

Parent 2
R W
P R | RR | RW |
a W | WR | WW |
r

Genotypes:
- RR = red
- RW or WR = pink (blend)
- WW = white

Phenotypic ratio: 1 red : 2 pink : 1 white.

This is incomplete dominance because the heterozygote shows an intermediate (blended) phenotype rather than one allele being completely dominant. It's not simple dominant/recessive or sex-linked.