Home > Punnett Square Practice Chapter 9
GENETICS
Practice
Chapter 11
The parents in this cross are _____________
Homozygous
Heterozygous
Heterozygous
If G is dominant for green
pods and g is recessive for yellow pods, what percentage of the offspring
will have green pods? _______%
75
gg
Gg
Gg
GG
G g
G
g
b
B
b
B
The genotype of the offspring in the blue box is _______
bb
The offspring in the blue box is
homozygous
heterozygous
homozygous
b
B
b
B
In guinea pigs black fur
(B) is dominant over brown fur (b). The Punnett square for a cross
between a HETEROZYGOUS black guinea pig and a PURE brown guinea pig
would look like
This is the
Correct
setup
Heterozygous = Bb
Pure brown
= bb
b
b
B
B
b
b
b
B
B
B
b
B
Another name for pure is
_________________
homozygous
Bo
AB
B
Ao
AA
A
o
A
F
A & B are codominant
The alleles for blood type
show 2 kinds of inheritance..
The following statements
are TRUE or FALSE?
A is dominant over B.
O is dominant over A.
A is dominant over O.
B and A are co-dominant
A is incompletely dominant over O.
O is recessive to A and
to B
F
O is recessive to both A & B
T
T
F
T
An organism
has the genotype Xy.
What are the possible sperm it can produce?
______
______
THINK ABOUT IT:
If females have an XX genotype
and can only give X genes, which parent is the one that determines whether
the baby is a boy or girl?
X
y
Father ;
The mother always gives an X
If the father gives a y, it��s a boy.
If the father gives an X; it��s a girl.
If you cross a homozygous
RED flowered four o��clock plant with a homozygous WHITE flowered plant,
ALL of the offspring produced have PINK flowers.
This type of inheritance
in which the heterozygote (Rr) shows a
blending of traits is called __________.
A. Dominant/recessive inheritance
B. Co-dominance
C. Incomplete dominance
Incomplete dominance
What are the possible phenotypes of their offspring?
(% and color)
Red throats (R) are dominant over white (r)
throats in Goonie birds.
Make a cross between a PURE
RECESSIVE and a HETEROZYGOUS Goonie bird.
50% red throats
50% white throats
Rr
rr
Rr
rr
R
r
r
r
What are the possible phenotypes of their offspring?
(% and color)
Black eyes (B) are dominant
over red eyes (b) in rats.
Make a cross between two HETEROZYGOUS
rats.
75 % black eyes
25% red eyes
B
b
B
b
BB Bb
Bb
bb
The parents in this cross are _____________
Homozygous
Heterozygous
Homozygous
If W is dominant for long
wings and w is recessive for short wings, what percentage of these offspring
will have short wings? _______%
0% only ww makes it short
Who is the
��Father of Genetics��?
Gregor Mendel
Which of the following genotypes
could be from a HETEROZYGOUS organism?
TT
Rr Ww
bb XX
Ss
Rr Ww Ss
What kind of cross is this?
Pure dominant X pure recessive
Heterozygous X heterozygous
Heterozygous X homozygous
Hybrid recessive X hybrid
pure
Heterozygous
X Homozygous
Another name for heterozygous
is _______________
hybrid
What is the probability the offspring will have straight tails?
In Reebops curly tails (T)
are dominant over straight tails (t).
Make a cross between a HOMOZYGOUS
DOMINANT and a HOMOZYGOUS RECESSIVE Reebop.
0%
All will be
Curly tailed (Tt)
Tt
Tt
Tt
Tt
T T
t
t
BT
bt bT
Bt
What type of gametes can
this organism produce?
BbTt
______
______ _______
_______
What type of gametes can
this organism produce?
BBTT
______
______ _______
_______
BT BT BT BT
tr
tR
Tr
TR
tr
tR
Tr
TR
Tall = T short = t R= round r=wrinkled
seeds
seeds
TtRr X TtRr
TTRR
TTRr TtRR TtRr
TTRr
TTrr TtRr
Ttrr
TtRR
TtRr ttRR
ttRr
TtRr Ttrr ttRr ttrr
This is an example of a DIHYBRID cross.
Which pattern of phenotypes
will be seen in the offspring?
9:3:3:1
How many offspring will be
Short AND Round? ______
Short AND wrinkled? ______
3/16
Recessive
and dominant
Recessive
and recessive
HINT:
9- dominant for both
3- recessive and dominant
3- dominant and recessive
1- recessive
and recessive
1/16
What do we call the offspring
of the F1 generation?
F2
Which of the following genotypes
could be from a HOMOZYGOUS RECESSIVE organism?
TT
bb Rr Ww
tt XX aa
bb tt aa
a
A
a
A
The genotype of the offspring in the blue box is _______
homozygous heterozygous
heterozygous
How many of the offspring
from this cross will show the dominant characteristic?
¾ (75%) – AA and Aa
gg
g
Gg
GG
G
g
G
G is dominant for green pods.
g is recessive for yellow
pods.
What is the genotype of
the offspring in the shaded box?
Gg
What is the phenotype of
the offspring in the shaded box?
Green pods
Which of the following is NOT TRUE?
Genotype determines phenotype
Alleles are different forms of the same gene.
Genotype is the way the genes
make you look.
Organisms with different genotypes
can have the same phenotype.
T
T
F
T
Tt and TT both look tall
What are the 3 different
kinds of inheritance you learned about?
Dominant/recessive
Incomplete dominance
Co-dominance
Offspring of the P1 generation are called
______
F1
What are the probable blood
types of the offspring?
What are the possible offspring
of a cross between a blood type AB mom and a type O dad?
50% Type A
50%
Type B
Ao
Bo
Ao
Bo
A B
O
O
Which of the following crosses
would you expect to see a 9:3:3:1 ratio in the offspring?
SSYY X ssyy
SsYy X SsYy
ssYY X SSyy
SsYy X SsYy
9:3:3:1 ratio is seen in dihybrid crosses
What will the offspring be like?
(% and color)
Purple (P)is the dominant color for monsters. Yellow is recessive (p).
Make a cross between a HOMOZYGOUS
purple and a yellow monster.
100% purple
Pp
Pp
Pp
Pp
P
P
p
p
What genotype would a PURPLE
dad have to be to make a yellow monster baby with a Purple (Pp) mom
monster?
?
?
p
P
pp
Pp
Dad needs
to have:
a little p to give one to
the baby
a big P to be purple himself
Wilma and Fred are going to have a baby.
Fred in AA and Wilma is oo.
What are the possible blood
types of their baby?
100% will have
A type blood
Ao
Ao
Ao
Ao
A
A
o
o
Wilma and Fred are going to have a baby.
Fred in AA and Wilma is oo.
What are the possible blood
types of their baby?
100% will have
A type blood
Ao
Ao
Ao
Ao
A
A
o
o
RT
rt rT
Rt
What type of gametes can
this organism produce?
RrTt
______
______ _______
_______
What type of gametes can
this organism produce?
WwGg
______
______ _______
_______
WG wg wG Wg
In a DIHYBRID HETEROZYGOUS
cross the offspring that are
9/16 are _______________
for both traits.
3/16 are _____________ for one trait and
_____________
for the other.
1/16 are _____________ for
both traits.
Dominant
FILL IN THE BLANKS WITH THE WORDS
Dominant OR Recessive
Dominant
Recessive
Recessive
In this cross: TtRr
X TtRt
What is the probability
the offspring will be:
Tall
AND white? ____/16
Short
AND red? ____/16
Tall
AND red? ___/16
Short AND white? ___/16
3
T = Tall R = red
t = short r = white
3
9
1
In this cross: TtYy
X TtYy
What is the probability
the offspring will be:
short
AND green? ____/16
Short
AND yellow? ____/16
Tall
AND green? ___/16
tall AND yellow? ___/16
1
T = Tall Y = yellow peas
t = short y = green peas
3
3
9
In this cross: YYRR X yyRR
Be careful!
What is the
probability the offspring will be:
Yellow
peas AND white flowers? ____/16
Green
peas AND red flowers? ____/16
Yellow
peas AND red flowers? ___/16
Green peas AND white flowers? ___/16
0
Y = yellow peas R = red flowers
y = green peas r = white
flowers
0
16
0
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