The ratio of yellow to green seed color among the offspring would depend on the genetic makeup of the parents. The inheritance of seed color in plants is controlled by genes, which are passed down from the parents to their offspring. If the seed color is controlled by a single gene with two possible alleles, one dominant allele that codes for yellow seed color and one recessive allele that codes for green seed color, then the ratio of yellow to green seed color among the offspring would be determined by the genotype (combination of alleles) of the parents.
If both parents are homozygous (have two copies of the same allele) for the dominant yellow allele, then all the offspring will have yellow seeds because they will inherit one copy of the dominant allele from each parent.
If both parents are heterozygous (have one copy of each allele) for seed color, then the ratio of yellow to green seed color among the offspring would be 3:1 (75% yellow and 25% green) because each offspring has a 75% chance of inheriting the dominant yellow allele and a 25% chance of inheriting the recessive green allele.
If one parent is homozygous dominant (YY) and the other is homozygous recessive (gg) then all the offspring will be heterozygous (Yg) and the ratio of yellow to green seed color among the offspring would be 1:1 (50% yellow and 50% green)
It is important to note that this is an example of Mendel's monohybrid cross, where only one characteristic is being considered, but in reality plants have multiple genes that control seed color, size and other characteristics.