← Mendellian Genetics Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Dominant A trait expressing itself Recessive A trait overshadowed by dominant Homozygous A trait with 2 dominant alleles Heterozygous A trait with both dominant and recessive alleles Genes Segments of DNA that define what certain traits an organism may have Diploid cells Double set of chromosomes Alleles Different forms of genes Genetics Study of how certain traits are expressed by genes Genotype Type of genes that one has Phenotype How genotype is expressed