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%