1. Bikini Bottom Genetics
Punnett Square Problems #1

2. 1. SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous for his square shape, but SpongeSusie is round. Create a Punnett square to show the possibilities if these two got married and had children. (S = squarepants, s = round) Ss
S s
SpongeBob = _____
SpongeSusie = ____ ss Ss ss s
____ % purebred squarepants
____ % hybrid squarepant
____ % squarepants
___ % roundpants 50 s ss Ss 50 50

3. 2. Patrick met Patti at the dance
2. Patrick met Patti at the dance. Both of them are heterozygous for their pink body color, which is dominant over a yellow body color. Create a Punnett square to show the possibilities if these two got married and had children. (P = pink body, p = yellow body)
P p Pp
Patrick = _____
Patti = ____ Pp P P P P p 75
____ % pink
____ % yellow
____ % homoz.
____ % heteroz 25 p P p p p 50 50

4. B B b b BB Bb Bb Bb Bb Squidward = _____ Wife = ____ bb ____ % blue
3. Everyone in Squidward’s family has light blue skin, which is the dominant trait for body color in his hometown of Squid Valley. His family brags that they are a “purebred” line. He recently married a nice girl who has light green skin, which is a recessive trait. Create a Punnett Square to see the possibilities if they had children. B = blue skin b = green skin BB
B B
Squidward = _____
Wife = ____ bb Bb Bb b
____ % blue
____ % green
____ % homoz.
____ % heteroz
100 Bb b Bb
100

5. B b B B B B b b B b b b Squidward’s son = _____ Bb Wife = ____ Bb
4. Assume that one of Squidward’s sons, who is heterozygous for the light blue color, married a girl who is also heterozygous. Create a Punnett square to show that the possibility that would result if they had children. (B = blue skin, b = green skin)
B b
Squidward’s son = _____
Wife = ____ Bb B B B Bb B b
____ % homoz.
____ % heteroz
____ % Blue 50 b B b b b 50 75

6. T t T T T T t T T T T t TT Tt ____ % tall eyes ____ % short eyes
5. Mr. Krabb’s and his wife recently had a Lil’ Krabby, but it was not a happy occasion for them. Mrs. Krabbs has been upset since she first say her new baby who had short eyeballs. She claims that the hospital goofed and mixed up her baby with someone else’s baby. Mr. Krabbs is homozygous for his tall eyes, while his wife is heterozygous for her tall eyes. Some members of her family have short eyes, which is the recessive trait. Create a Punnett square using T for the dominant gene and t for the recessive one. TT
Mr. Krabbs = _____
Wife = ____
T t Tt
____ % tall eyes
____ % short eyes T T T T t
100 T T T T t