Dihybrid Crosses
In our exploration of genetics, we will learn about something called a dihybrid cross, which helps us track two different traits at the same time! According to Mendel's law of independent assortment, genes that are located on different chromosomes are inherited independently from one another. This means that the traits can mix and match in various ways. For example, if both parents have two different traits and are heterozygous (which means they have one dominant and one recessive allele, like RrYy), we can predict the possible combinations of traits in their offspring. When we look at the results of this cross, we find that the expected ratio of different phenotypes is 9:3:3:1. However, this only applies when the genes we are studying are located on different chromosomes, which we call unlinked genes. Understanding these concepts helps us see how traits are passed down through generations!