Transcript Bikini Bottom Genetics

Bikini Bottom Genetics
Punnett Square Problems #1
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)
S
Ss
SpongeBob = _____
ss
SpongeSusie = ____
s
Ss
ss
Ss
ss
0 % purebred
____
squarepants
50 % hybrid
____
squarepant
50 % squarepants
____
50 % roundpants
___
s
s
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
Patrick = _____
Pp
p
Pp
Patti = ____
75
____ % pink
25 % yellow
____
50
____ % homoz.
50
____ % heteroz
P
PP
Pp
p
Pp
pp
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
Squidward
bb
Wife = ____
b
B
Bb
Bb
Bb
Bb
100 % blue
____
0
____
% green
0
____
% homoz.
100 % heteroz
____
b
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
Squidward’s son =
Bb
_____
Bb
Wife = ____
50
____ % homoz.
50
____ % heteroz
75
____ % Blue
b
B
BB
Bb
b
Bb
bb
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 = _____
T
t
T
TT
T t
T
TT
T t
Tt
Wife = ____
100
____ % tall eyes
0
____ % short eyes