Genetics Punnett Square Problems Explained
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Punnett
Square
Problems
Created
by
Peggy
Lenz
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KEY
G:
P:
KEY
GG
Gg
gg
G:1/2 GG, 1/2 Gg
P: 4/4 gray fur
G= gray
g=white
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GG
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KEY
G:
P:
KEY
EE
Ee
ee
G:4/4 Ee
P: 4/4 will have 3 eyes
E=3 eyes
e=2 eyes
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KEY
G:
P:
KEY
SS
Ss
ss
G:1/4 SS, 2/4 Ss, 1/4 ss
P: 3/4 seeds, 1/4 no seeds
S= seeds
s= no seeds
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S
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SS
Ss
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ss
INCOMPLETE DOMINANCE
INCOMPLETE DOMINANCE
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KEY
G:
P:
KEY
LL
NN
LN
Could any of their kittens have long tails?
LL=long
NN=no
LN=short
N
N
N
L
LN
NN
LN
NN
Explore Punnett Square problems involving genetic traits such as fur color in mice, number of eyes in aliens, seed production in tomato plants, and tail length in cats. Understand dominant and recessive gene interactions through visual examples and answer key explanations.
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Presentation Transcript
Genetics Punnett Square Problems Created by Peggy Lenz
Gray fur is dominant in mice over white. A purebred gray mouse is crossed with a hybrid female. What color fur may their offspring have?
KEY G: P:
g G KEY G= gray g=white GG Gg G GG Gg gg GG Gg G G:1/2 GG, 1/2 Gg P: 4/4 gray fur
Aliens from Saturn usually have 3 eyes. A female with 2 eyes is crossed with a purebred, dominant 3 eyed male. Will any offspring have only 2 eyes?
KEY G: P:
e e KEY E=3 eyes e=2 eyes Ee Ee E EE Ee ee Ee Ee E G:4/4 Ee P: 4/4 will have 3 eyes
The dominant gene S produces seeds in tomato plants. Two plants both heterozygous are crossed. Will any any of the fruit contain no seeds?
KEY G: P:
s S KEY S= seeds s= no seeds SS Ss S SS Ss ss Ss ss s G:1/4 SS, 2/4 Ss, 1/4 ss P: 3/4 seeds, 1/4 no seeds
INCOMPLETE DOMINANCE A long tailed cat has a genotype of LL. A Manx cat with no tail has genotype NN. A short-tailed cat has genotype LN. A female Manx cat mates with a male short-tailed cat.
KEY G: P:
KEY N N LL=long NN=no LN LN L LN=short NN NN N LL NN LN Could any of their kittens have long tails?
