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Bikini Bottom Genetics “The genetic traits of a sponge”
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Trait Dominant Gene Recessive Gene Body Shape Squarepants (S) Roundpants (s) Body Color Yellow (Y) Blue (y) Eye Shape Round (R) Oval (r) Nose Style Long (L) Stubby (l) What would be a sponge’s phenotype if it had each of the following pair of alleles: ss RR Yy ll What would be a sponge’s phenotype if it had each of the following pair of alleles: LL YY Ss rr
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Oh goodie! I love this science stuff!
Trait Dominant Gene Recessive Gene Body Shape Squarepants (S) Roundpants (s) Body Color Yellow (Y) Blue (y) Eye Shape Round (R) Oval (r) Nose Style Long (L) Stubby (l) Oh goodie! I love this science stuff! What could be the genotype(s) for these traits: Yellow body Round pants Long nose Oval eyes
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Trait Dominant Gene Recessive Gene Body Shape Squarepants (S) Roundpants (s) Body Color Yellow (Y) Blue (y) Eye Shape Round (R) Oval (r) Nose Style Long (L) Stubby (l) What would the genotype be for each of these traits: Heterozygous Round Eyes Homozygous Long Nose Homozygous Squarepants
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Once upon a time, one of SpongeBob’s cousins, SpongeBillyBob, fell in love with a cute squarepants girl named SpongeSally. 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.
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Trait Dominant Gene Recessive Gene Body Shape Squarepants (S) Roundpants (s) For starters: If SpongeSally’s father is heterozygous squarepants, and her mother is a roundpants, what is her genotype? (We know her phenotype is squarepants) Father’s Alleles S s S s Ss ss Mother’s Alleles
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What is the probability of kids with squarepants? Roundpants?
Trait Dominant Gene Recessive Gene Body Shape Squarepants (S) Roundpants (s) So we now know that SpongeSally is heterozygous squarepants, and if SpongeBillyBob is also, what would be the possible genotypes and phenotypes if they had children? BillyBob’s Alleles S s SS Ss ss S s Sally’s Alleles What is the probability of kids with squarepants? Roundpants?
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Would any of their children have oval eyes? Might their grandchildren?
Trait Dominant Gene Recessive Gene Eye Shape Round (R) Oval (r) SpongeBob’s aunt and uncle, SpongeWilma & SpongeWilbur 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. Wilbur’s Alleles R r R RR r Rr Wilma’s Alleles Would any of their children have oval eyes? Might their grandchildren?
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Trait Dominant Gene Recessive Gene Nose Style Long (L) Stubby (l) SpongeBob’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 l ll
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Trait Dominant Gene Recessive Gene Nose Style Long (L) Stubby (l) If SpongeBob’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…
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Trait Dominant Gene Recessive Gene Nose Style Long (L) Stubby (l) Eye Shape Round (R) 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? LlRr Long/Round – Long/Oval – Stubby/Round – Stubby/Oval – LR Lr lR lr LLRR LLRr LlRR LlRr LLrr Llrr llRR llRr llrr LR Lr lR lr LLRR LLRr LlRR LlRr LLrr Llrr llRR llRr llrr LR Lr lR lr LLRR LLRr LlRR LlRr LLrr Llrr llRR llRr llrr LR Lr lR lr LLRR LLRr LlRR LlRr LLrr Llrr llRR llRr llrr LR Lr lR lr LLRR LLRr LlRR LlRr LLrr Llrr llRR llRr llrr LR Lr lR lr LlRr
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Trait Dominant Gene Recessive Gene Nose Style Long (L) Stubby (l) Eye Shape Round (R) 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? L l LL Ll ll L l Long/Round – Long/Oval – Stubby/Round – Stubby/Oval – R r RR Rr rr R r AS - Dihybrid Crosses
