Memory Game Biology: Basic Genetics Memory MatchOnline version Memorize key genetics terms by pairing each concept with its definition. by Alicia Pearce Different forms of a gene. DNA code that determines which traits show. Visible features you can see. Dominant Phenotype Recessive Nucleus Hidden when the dominant trait is present. Genotype The passing of traits from parents to offspring. Alleles A trait that always shows up. Chromosomes The cell's control center storing instructions. Heredity Threads inside a cell carrying genes.