Gregor Mendel used pea plants that were heterozygous for each of two traits - seed color and seed shape-to generate a dihybrid cross. The phenotypic ratio of the resulting offspring was nine with round and yellow seeds, three with round and green seeds, three with wrinkled and yellow seeds, and one with wrinkled and green seeds. From these results, what could Mendel conclude? Traits are inherited as pairs, sets, or groups. Traits that are dominant mask traits that are recessive. Gametes carry one allele for each trait. Traits are passed independently of one another.

Mendel's experiments with pea plants laid the groundwork for the principles of inheritance we know today. His dihybrid cross demonstrated that traits like seed color and shape are inherited separately—today, we call this the Law of Independent Assortment. He discovered that the ratio of dominant to recessive phenotypes in the second generation was consistently 9:3:3:1, reinforcing his theories about how traits are passed down through generations. In practical terms, Mendel's findings on gene inheritance have had vast implications in fields like agriculture and genetics. For example, plant breeders utilize Mendelian principles to develop new crops with desired traits, such as disease resistance or increased yield. Understanding how traits are inherited allows scientists to selectively breed plants and animals for specific characteristics, ultimately enhancing food production and sustainability.