Matching Pairs Mendel GeneticsOnline version His research showed that traits are inherited as discrete units. He came up with two important laws in genetics. What do you know about his work to get your clue? by Deanna Squire Squire 1 refers to the genetic makeup of a specific set of genes (TT, Tt, tt) 2 Considered the father of Genetics 3 Homozygous genotype 4 Heterozygous genotype 5 allele that is expressed only when two copies are present (t) 6 The physical characteristic, or traits that is expressed (Tall, Short) 7 Allele that is expressed when two different alleles are present (T) 8 States that organisms inherit 2 copes of each gene, one from each parent and that during the formation of games the two copies of each gene separate. Dominant Recessive (3) TT (8) Genotype Phenotype (7) Law of Segregation Mendel (1) Tt (2)