In snapdragon flowers petal coloration is incompletely dominant with petals either being red,
white, or pink. If two plants are bred creating several hundred offspring all of which are pink
what would be the most likely phenotypes of the parent plants?

Incomplete dominance occurs when when both the alleles of a gene are partially expressed and resulting in an intermediate or a completely different phenotype.

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One parent will be red (RR) and the other will be white (rr)

Explanation:

Incomplete dominance is a genetic scenario whereby one allele of a gene is not completely dominant over the other, hence, both alleles form an hybrid that has a different phenotype from both parents. In this case, it involves a gene coding for flower colour in snapdragon plants.

Allele for red color (R) is incompletely dominant over the allele for white color (r). Hence both alleles form an heterozygous (Rr) pink phenotype (pink) that is a blending of both parents phenotype. A red flower color will be produced when the plant is homozygous for the red allele (RR) while the white flower colour will be phenotypically expressed when the plant is homozygous for the white allele (rr).

In this case where two parents where crossed to produce several hundreds of offsprings that exhibited the pink color (hybrid, Rr). This means that the parents were most likely red (RR) and white (rr).

That is, RR × rr All Rr

the answer to your question is sperm

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