Bikini Bottom Genetics 2 (Page 2 of 3) in pdf

Bikini Bottom Genetics 2 Page 2

5. SpongeBob’s aunt and uncle, SpongeWilma and SpongeWilbur, have the biggest round eyes in the

family. Wilma is believed to be heterozygous for her round eye shape, while Wilbur’s family brags that they

are a pure line. Complete the Punnett square to show the possibilities that would result if Wilma and Wilbur

had children.

(a) Give the genotype for each person.

Wilma - _______

Wilbur - ________

(b) Complete the Punnett square below to show the possibilities that would result if they had children.

(d) What is the probability that the kids would have round eyes? ____ %

(e) What is the probability that the kids would be oval eyes? ____ %

6. SpongeBob’s mother is so proud of her son and his new wife, SpongeSusie, as they are expecting a little

sponge. She knows that they have a 50% chance of having a little roundpants, but is also hoping the new

arrival will be blue (a recessive trait) like SpongeSusie and many members of her family. If SpongeBob is

heterozygous for his yellow body color, what are the chances that the baby sponge will be blue? Create a

Punnett square to help you answer this question.

7. SpongeBob’s aunt is famous around town for her itty, bitty stubby nose! She recently met a cute

squarepants fellow who also has a stubby nose, which is a recessive trait. Would it be possible for them to

have a child with a regular long nose? Why or why not? Create a Punnett square to help you answer this

question.

8. If SpongeBob’s aunt described in #7 wanted children with long noses, what type of fellow would she

need to marry in order to give her the best chances? Create a Punnett square to help you answer this

question.

Worksheet created by T. Trimpe 2003

Bikini Bottom Genetics 2 Page 2