Trait Body Shape Body Color Eye Shape Nose

Trait Body Shape Body Color Eye Shape Nose Style Dominant Gene Squarepants (S) Yellow (Y) Round (R) Long (L) Recessive Gene Roundpants (s) Blue (y) Oval (r) Stubby (l) What would be a sponge’s phenotype if it had each of the following pair of alleles: LL YY Ss rr ss RR Yy ll

Trait Body Shape Body Color Eye Shape Nose Style Dominant Gene Squarepants (S) Yellow (Y) Round (R) Long (L) What could be the genotype(s) for these traits: • Yellow body • Round pants • Long nose • Oval eyes Recessive Gene Roundpants (s) Blue (y) Oval (r) Stubby (l) Oh goodie! I love this science stuff!

Trait Body Shape Body Color Eye Shape Nose Style Dominant Gene Squarepants (S) Yellow (Y) Round (R) Long (L) Recessive Gene Roundpants (s) Blue (y) Oval (r) Stubby (l) What would the genotype be for each of these traits: • Heterozygous Round Eyes • Homozygous Long Nose • Homozygous Squarepants

Once upon a time, one of Sponge. Bob’s cousins, Sponge. Billy. Bob, fell in love with a cute squarepants girl named Sponge. Sally. After dating for a few years (and graduating from Bikini Bottom University), they got married and decided to start a family. Let’s use our understanding of genetics to predict their future as well as for some other citizens of Bikini Bottom.

Trait Body Shape Dominant Gene Squarepants (S) Recessive Gene Roundpants (s) For starters: If Sponge. Sally’s father is heterozygous squarepants, and her mother is a roundpants, what is her genotype? (We know her phenotype is squarepants) Mother’s Alleles Father’s Alleles S s s Ss ss

Trait Body Shape Dominant Gene Squarepants (S) Recessive Gene Roundpants (s) So we now know that Sponge. Sally is heterozygous squarepants, and if Sponge. Billy. Bob is also, what would be the possible genotypes and phenotypes if they had children? Sally’s Alleles Billy. Bob’s Alleles S SS Ss ss What is the probability of kids with squarepants? Roundpants?

Trait Eye Shape Dominant Gene Round (R) Recessive Gene Oval (r) Sponge. Bob’s aunt and uncle, Sponge. Wilma & Sponge. Wilbur have the biggest round eyes in the family. Wilma is believed to be heterozygous for her eye shape, and Wilbur’s family brags that they are a “pure” line for round eyes. Complete a Punnett square to show the possibilities that would result if Wilma and Wilbur had children. Wilma’s Alleles Wilbur’s Alleles R RR RR r Rr Rr Would any of their children have oval eyes? Might their grandchildren?

Trait Nose Style Dominant Gene Long (L) Recessive Gene Stubby (l) Sponge. Bob’s aunt is famous around town for her itty, bitty stubby nose! She recently met a handsome squarepants fellow who also has a stubby nose. Would it be possible for them to have a child with a long nose? Create a Punnett square to defend your answer. I don’t even have a nose! l ll ll ll

Trait Nose Style Dominant Gene Long (L) Recessive Gene Stubby (l) If Sponge. Bob’s aunt with the stubby nose wanted children with long noses, what type of fellow would she need to marry in order to for that to happen? What would give her the best chances? Use this guy again…

Trait Nose Style Eye Shape Dominant Gene Long (L) Round (R) Recessive Gene Stubby (l) Oval (r) If a sponge that is both heterozygous for their nose and eyes crosses with another heterozygous sponge, what would be the likely traits of their offspring? Ll. Rr Long/Round – Long/Oval – Stubby/Round – Stubby/Oval – Ll. Rr LR Lr l. R lr LR LLRr Ll. RR Ll. Rr Lr LLRr LLrr Ll. Rr Llrr l. R Ll. Rr ll. RR ll. Rr lr Ll. Rr Llrr ll. Rr llrr

Trait Nose Style Eye Shape Dominant Gene Long (L) Round (R) If a sponge that is both heterozygous for their nose and eyes crosses with another heterozygous sponge, what would be the likely traits of their offspring? Long/Round – Long/Oval – Stubby/Round – Stubby/Oval – AS - Dihybrid Crosses Recessive Gene Stubby (l) Oval (r) L l L LL Ll ll R r R RR Rr rr