Punnett squares

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Punnett squares
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The tool which uses the combination of alleles to
predict the probability of traits showing up in
offspring.
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Green eyes are dominant and yellow eyes are
recessive. The genotype of two insects are Gg
and Gg.
Complete a Punnett square!
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g
G
GG
Gg
G
??
Gg
g
?? gg
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What of the young would have green eyes?
75
Yellow eyes?
25
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If Bblack and bbrown and two wolves are
heterozygous Bb and homozygous bb what would
their young be?
Complete a Punnett square!
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b
B
Bb
bb
b
bb
Bb
b
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What of young would be black and what would
be brown?
Black 50 Brown 50
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BBrown eyes which are dominant, bblue eyes
which are recessive What are the alleles of the
parents for the following chart?
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b
B
BB
Bb
B
b
bb
Bb
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The parents would be Bb and Bb and both would
have brown eyes!
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Curly hair is dominant, and a couple have curly
hair. How many of their babies will have curly
hair?
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A. All of the babies B. Probably most of
the babiesC. None of the babies
Answer - B
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What percent of your genes come from each parent?
50
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What of genes come from each grandparent?
25
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If green snake skin is dominant and yellow is
recessive, what are the alleles of the parent
snakes for the following

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G
G
Gg
Gg
g
g
Gg
Gg
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Homozygous (GG) green
Homozygous (gg) yellow
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How many different Punnett squares can you think
of?
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If big ears are dominant and both parents are
homozygous dominant, what percent of babies will
have big ears?
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E
E
EE
EE
E
EE
EE
E
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100
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Three fingers is dominant and five fingers
recessive. If mom is homozygous dominant and dad
is heterozygous, what percent of young will have
three fingers?
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F
F
FF
FF
F
Ff
Ff
f
25
100
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Big noses are dominant and little noses are
recessive. If Dad is homozygous dominant and mom
is homozygous recessive, what percent of children
will have big honkers?
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N
N
Nn
Nn
n
Nn
Nn
n
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100
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Short is dominant and tall is recessive. If dad
is heterozygous dominant and mom is homozygous
recessive, what percent of the children will be
short and tall?
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s
S
Ss
ss
s
ss
Ss
s
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50 short
50 tall
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Long neck is dominant and short neck is
recessive. If dad is heterozygous dominant and
mom is heterozygous dominant, what percent of the
children will have long necks and short necks?
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n
N
NN
Nn
N
nn
Nn
n
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75 Long
25 Short
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Short tongues are dominant and long are
recessive. If mom is homozygous recessive and
dad is homozygous recessive, what percent of the
children will have long tongues?
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t
t
tt
tt
t
tt
tt
t
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100
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Thank you