Bikini Bottom Practice Genetics Worksheet With Answer Key Page 2
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212. While Squidward’s family boasts about being a purebred line for dominant light blue skin color,
they are also purebred for a less distinguished trait: the recessive trait of baldness. Lack of hair
causes Squidward some self-esteem issues that he does not want his children to face. He would like
to ensure that his offspring have hair AND his blue skin color. What traits should he look for in a
bride?
Must she have hair? Explain
She must have hair to pass that trait down to the offspring. To ensure all
of his offspring have hair she must be homozygous dominant for that trait.
Must she be blue? Explain.
She does not need to be blue, because Squidward will pass down the
blue trait to all of his offspring.
13. Squidward has found a potential bride prospect with the green squid Octavia. While Octavia has
hair, her father does not. Determine the chances of their child being blue and having hair.
Squidward =
BBhh
Octavia =
bbHh
14. Use the genotypes in #13 to complete the Punnett square below and then answer the questions.
Bh
bH
BbHh
bh
Bbhh
For which traits, if any, is it possible for their offspring to be purebred
It is possible for their offspring to be purebred
bald.
What is the probability of their children being heterozygous for both traits?
50% or ½
15. After spending some time with Octavia, Squidward decides that she is not his perfect match and much prefers
her sister, Olivia. Olivia also has hair, but unlike her sister she has blue skin. Unfortunately she also has very bushy
eyebrows that Squidward does not want his children to have. His mother has bushy eyebrows and Squidward thinks
they make her dumber (much like Patrick’s make him dumber.) Luckily in squid, bushy eyebrows are recessive to
lack of eyebrows. What are the parental genotypes for all three traits?
Squidward =
BBhhEe
Olivia =
BbHhee
What are the chances that their offspring will be blue, with no eyebrows?
50% of their offspring will be blue with no eyebrows
Be
be
BE
BBEe
BbEe
Be
BBee
Bbee
What are the chances their offspring will be green?
None of their offspring will be green!
What are the chances that their offspring will be bald, but still have bushy eyebrows?
¼ or 25% of the offspring would be both bald and have bushy eyebrows.
He
he
hE
HhEe
hhEe
he
Hhee
hhee
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