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The first example of association between a marker locus and a quantitative trait was documented in 1923 in a bean species (Phaseolus vulgaris) involving seed size and color. Consider the two parental lines below. Yellow pigmentation is dominant to white.

Parental line Color Seed weight, mg
Yellow eye 1317 Yellow 480
White 1228 White 210

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These two lines were crossed to produce F1 individuals, which in turn were interbred to make the F2 generation. The table below shows the genotypes and average seed weights among F2 individuals.

Genotype PP (yellow) Pp (yellow) pp (white)
Average seed weight 307 283 264

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The genotypes of the yellow F2 plants were based on observations of color in their F3 progeny.

Based on these data, pigmentation
Select Option waswas not
asociated with seed weight because the pigmentation locus appeared to
Select Option not affectdominantly affectnot additively affectadditively affect
seed weight.
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