Related Terms: Allele, Genes, Homozygous
Organisms have two alleles for each trait. When the alleles of a pair are heterozygous, one is dominant and the other is recessive. Using the previous example, round seed shape (R) is dominant and wrinkled seed shape (r) is recessive. Round: (RR) or (Rr), Wrinkled: (rr).
Related Resources: Chromosomes and Gender, Law of Segregation, Independent Assortment