If two heterozygous Yy pea plants are crossed, the proportion of offspring that will be the dominant color yellow is 75% or ¾.
Heterozygous in genetics means that an organism has two different alleles of a given gene.
According to this question, a gene coding for pea color is involved. Yellow color is dominant over green.
This means that the yellow (dominant) color will be encoded by allele Y, while the green (recessive) color will be encoded by allele y.
Hence, if two heterozygous genotype crosses i.e. Yy × Yy, the offsprings will be as follows:
Therefore, if two heterozygous Yy pea plants are crossed, the proportion of offspring that will be the dominant color yellow is 75% or ¾.
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