In humans, brown hair is dominant. Red hair is recessive. A purebred redhead has a child with a person with hybrid brown hair. = Purebred Brown = Hybrid Brown = Purebred Red H = h = Genotype: Phenotype: brown red HH HhHh hh h H h hhhh h h h HH 2/4 (50%) Hh 2/4 (50%) hh 2/4 (50%) H - Brown 2/4 (50%) P - Red

In humans, tongue rolling is dominant. Not able to roll your tongue is recessive. A person hybrid for tongue rolling has a child with another hybrid person. T = t = Genotype: Phenotype: Can roll tongue Can’t roll tongue TT = P – can roll Tt = H – can roll tt = P – can’t roll Tt T t T T t T T t t t 1/4 (25%) TT 2/4 (50%) H – can roll 2/4 (50%) Tt 1/4 (25%) tt 1/4 (25%) P – can roll 1/4 (25%) P – can’t roll

In cats, loud meows are dominant over soft meows. A cat that meows softly mates with a cat that is hybrid for meowing. = Genotype: Phenotype: M loud meow m soft meow MM = P – loud meow Mm = H – loud meow mm = P – soft meow mm M m m M m M m m m m 2/4 (50%) Mm 2/4 (50%) mm 2/4 (50%) H – loud meow 2/4 (50%) P – soft meow

No dimples are dominant in people. Fred and Wilma Flintstone both have no dimples. The Fred is purebred and the Wilma is not. = Genotype: Phenotype: DD = P – no dimples Dd = H – no dimples dd = P - dimples D NO dimples d dimples DD D d D D D D D d D d 2/4 (50%) DD 2/4 (50%) Dd 2/4 (50%) P – no dimples 2/4 (50%) H – no dimples

In humans, straight hair is most common; curly hair is rare. A woman that is purebred for straight hair has a child with a man that has curly hair. = Genotype: Phenotype: HH = P - straight Hh = H - straight hh = P - curly H straight hair h curly hair HH h h H h H h H h H h 4/4 (100%) Hh 4/4 (100%) H – straight