You conclude yellow parent which was homozygous for the dominant allele.
The yellow is dominant over green, as genome of every organism is consists of two nearly identical copies of alleles a gene.
It is so because we have two copies of each gene is that we inherit one from each parent, for a cross between a plant with yellow peas and one with green peas. The yellow seed color is the dominant phenotypic character and the green seed color is the recessive phenotypic character in this cross, plants with yellow seed offspring and green seed offspring are formed in the ratio of 3:1, which is a phenotypic ratio.
Therefore, in this case yellow-seed allele is dominant and the green-seed allele is recessive.
To learn more about phenotypic ratio here
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