Punnett squares. The tool which uses the combination of alleles to predict the probability of...
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Punnett squares
The tool which The tool which uses the uses the
combination of combination of alleles to predict alleles to predict the probability of the probability of traits showing up traits showing up
in offspring.in offspring.
Green eyes are dominant and yellow eyes are recessive. The genotype of the two insects are Gg
and Gg.Complete a Punnett
square!
G
Gg
GgGG
g
Gg
??
What % of the young would have green
eyes?
Yellow eyes?75%
25%
If B=black and b=brown and two wolves are
heterozygous Bb and homozygous bb what would
their young be?
Complete a Punnett square!
B
Bb
bbBb
b
bb
bb
What % of young would be black and what % would be
brown? Black = 50 %Brown = 50 %
B=Brown eyes which are dominant, b=blue
eyes which are recessive
What are the alleles of the parents for the
following chart?
B
Bb
BbBB
b
Bb
bb
The parents would be Bb and Bb and both would have
brown eyes!
What percent of your genes come from
each parent?
50%
What % of genes come from each
grandparent? 25%
If green snake skin is dominant and
yellow is recessive, what are the alleles of the
parent snakes for the following:
G
Gg
GgGg
g
gG
Gg
Homozygous (GG) green
Homozygous (gg) yellow
If big ears are dominant and both
parents are homozygous
dominant, what percent of babies will
have big ears?
E
EE
EEEE
E
EE
EE
100%
Dimples is dominant and not having dimples is recessive. If mom is homozygous dominant
and dad is heterozygous, what percent of young will
have Dimples?
D
Ff
FFFF
d
DD
Ff
100%
Big noses are dominant and little noses are recessive. If Dad is
heterozygous and mom is homozygous
recessive, what percent of children will have big
noses?
N
Nn
nnNn
n
nn
nn
100%
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?
S
Ss’
s’s’Ss’
s’
s’s’
s’s’
50% short50% tall
Long neck is dominant and short neck is
recessive. If dad is heterozygous dominant
and mom is heterozygous
dominant, what percent of the offspring will
have long necks and short necks?
N
Nn
NnNN
n
Nn
nn
75% Long25% Short
Short tongues are dominant and long are recessive. If mom is
homozygous recessive and dad is homozygous recessive, what percent
of the offspring will have long tongues?
t
tt
tttt
t
tt
tt
100%