Homozygous yellow peas have two identical alleles for yellow color (YY), while heterozygous yellow peas have one yellow allele and one non-yellow allele (Yy). This means that homozygous yellow peas will always produce yellow offspring when crossed, while heterozygous yellow peas have a 50% chance of producing non-yellow offspring when crossed with another heterozygous pea plant.
yellow peas
yellow peas
The genotype of a plant producing green peas would be "yy," indicating that it carries two recessive alleles for yellow peas. The dominant allele for yellow peas is represented by "Y."
There would be four possible phenotypes: round yellow peas, round green peas, wrinkled yellow peas, and wrinkled green peas. This is due to the different combinations of alleles for seed shape (R for round, r for wrinkled) and seed color (Y for yellow, y for green) that can result from the cross.
Since smooth yellow peas are dominant traits (represented by genotypes RRYY or RRYy), all offspring from a cross between two plants with smooth yellow peas will also have smooth yellow peas. Therefore, 100% of the offspring will have this phenotype.
green peas if it does not also have a dominant allele for yellow peas.
y
green peas if it does not also have a dominant allele for yellow peas.
2
yellow peas
Yellow split peas.