1. TraitDominant Allele/SymbolRecessive Allele/Symbol Body shapeSquarepants (S)Roundpants (s) Body colorYellow (Y)Blue (y) Eye shapeRound (R)Oval (r) Nose styleLong (L)Stubby (l) Genotype LL Yy Ss RR Phenotype Long nose Yellow body Squarepants Round eyes Genotype Rr Ll Ss Yy Phenotype Round eyes Long Nose Squarepants Yellow body

2. TraitDominant Allele/SymbolRecessive Allele/Symbol Body shapeSquarepants (S)Roundpants (s) Body colorYellow (Y)Blue (y) Eye shapeRound (R)Oval (r) Nose styleLong (L)Stubby (l) Phenotype Yellow Body Roundpants Oval eyes Long nose Phenotype Stubby nose Round eyes Squarepants Blue body Genotype YY, Yy ss rr LL, Ll Genotype ll RR, Rr SS, Ss yy

3. TraitDominant Allele/SymbolRecessive Allele/Symbol Body shapeSquarepants (S)Roundpants (s) Body colorYellow (Y)Blue (y) Eye shapeRound (R)Oval (r) Nose styleLong (L)Stubby (l) Genotype Description Heterozygous round eyes Purebred squarepants Homozygous long nose Hybrid* yellow body *Hybrid = Heterozygous Genotype Rr SS LL Yy

4. TraitDominant Allele/SymbolRecessive Allele/Symbol Body shapeSquarepants (S)Roundpants (s) Body colorYellow (Y)Blue (y) Eye shapeRound (R)Oval (r) Nose styleLong (L)Stubby (l) One of SpongeBob’s cousins, SpongeBillyBob, recently met a cute squarepants girl named SpongeGerdy at a Pineapple Day Dance. They fell in love and are getting married. They are curious about their genetics and their potential offspring. Help them by solving the following problems: If SpongeGerdy’s father is a heterozygous squarepants, and her mother is a roundpants, what is SpongeGerdy’s genotype? Ss Mom’s genotype Dad’s genotype ss Ss S s s s ss Ss

5. SpongeBillyBob is heterozygous for his squarepants shape. What is his genotype? Ss SpongeBillyBob Ss ss SS S S s s Possible genotypes (ratio) 1SS:2Ss:1ss Probability of kids with squarepants ¾ or 75% 1SS + 2Ss = 3 Probability of kids with roundpants ¼ or 25% 1ss SpongeGerdy

6. Bikini Bottom Genetics are great!