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GENETICS Practice
Chapter 9
G
g
G GG Gg
g Gg gg
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? _______%
¾ or 75%
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
In guinea pigs black fur (B) is dominant over white
fur (b). The Punnett square for a cross between a
HETEROZYGOUS black guinea pig and a PURE
white guinea pig would look like
B B
B b
B b
B b
B
b
b
B
b
b
b
B
This is the
Correct setup
Heterozygous = Bb
Pure white = bb
Another name for pure is _________________
homozygous
A o
A
B
AA Ao
The alleles for blood
type show 2 kinds of
inheritance..
AB Bo
The following statements
are TRUE or FALSE?
F
F
T
T
F
T
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
An organism has the genotype Xy.
What are the possible sperm it can produce?
______
______
X
y
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? 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
R
r
r
Rr
Rr
r
rr
rr
What are the 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
B
b
B
BB
Bb
b
Bb
bb
What are the 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
What would a blood
cell from a person
with B type blood
look like?
A person with this phenotype could
have 2 possible genotypes.
Bo
______
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 has short
Who is the “Father of Genetics”?
Gregor Mendel
Which of the following genotypes could
be from a HETEROZYGOUS organism?
TT
Rr
Ww
Rr
Ww
bb
XX
Ss
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
t
t
T
T
Tt
Tt
Tt
Tt
In Reebops curly tails
(T) are dominant over
straight tails (t).
Make a cross between a
HOMOZYGOUS
DOMINANT and a
HOMOZYGOUS
RECESSIVE Reebop.
What % of the offspring will 0%
have straight tails?
All will be Curly tailed (Tt)
TtRr X TtRr
TR
Tr
tR
tr
TTRR
TTRr
TtRR
TtRr
Tr
TTRr
TTrr
TtRr
Ttrr
tR
TtRR
TtRr
ttRR
ttRr
tr
TtRr
Ttrr
ttRr
ttrr
TR
Tall = T
short = t
R= round
seeds
r=wrinkled
seeds
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
3/16
Short AND Round? ______
Recessive and dominant
1/16
Short AND wrinkled? ______
Recessive and recessive
HINT:
9- dominant for both
3- recessive and dominant
3- dominant and recessive
1- recessive and recessive
What would a blood
cell from a person
with A type blood
look like?
A person with this phenotype could
have 2 possible genotypes.
Ao
______
AA
_______
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
bb
Rr
Ww
tt
tt
XX
aa
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
G g
G
g
G is dominant for green pods.
g is recessive for yellow pods.
GG Gg
Gg gg
What is the genotype of the
offspring in the shaded box?
What is the phenotype of the
offspring in the shaded box?
Gg
Green pods
Which of the following is NOT TRUE?
T Genotype determines phenotype
T Alleles are different forms of the same gene.
Genotype is the way the genes
F
make you look.
T Organisms with different genotypes
can have the same phenotype.
Tt and TT both look tall
What would a blood
cell from a person
with AB type
blood look like?
A person with this phenotype would
have this genotype.
AB
______
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
______
O
O
A
B
Ao
Bo
Ao
Bo
What will the % and blood
type of the offspring be?
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
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
P
p
p
P
Pp
Pp
Pp
Pp
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
What would a blood
cell from a person
with O type blood
look like?
A person with this phenotype would
have this genotype.
oo
______
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
O blood is called the
Type ____
“Universal Donor” because in an
emergency it can be given to people
with ALL blood types. (A,B,O,AB)
AB blood is called the
Type _____
“Universal recipient” because it can
receive blood from all of the different
Blood types.