Final answer:
To determine the proportion of offspring exhibiting a particular phenotype/genotype for a single trait in a monohybrid cross, a Punnett square analysis should be conducted.
Step-by-step explanation:
To determine the proportion of offspring exhibiting a particular phenotype/genotype for a single trait in a monohybrid cross, the most appropriate method is to conduct a Punnett square analysis. A Punnett square can be used to predict the possible outcomes of a genetic cross and their expected frequencies.
In the case of a monohybrid cross between true-breeding pea plants with yellow and green pea seeds, where the dominant seed color is yellow (YY) and the recessive seed color is green (yy), all offspring will have the genotype Yy and display the yellow seed phenotype.
This method allows for determining both genotypic and phenotypic ratios based on the pattern of inheritance (dominant or recessive) known for the trait being studied.