Title: GENETICS Practice Chapter 11
1GENETICS PracticeChapter 11
2G g
The parents in this cross are _____________
Homozygous Heterozygous
Heterozygous
G g
GG Gg
Gg gg
If G is dominant for green pods and g is
recessive for yellow pods, what percentage of the
offspring will have green pods? _______
75
3B b
B
b
The genotype of the offspring in the blue box is
_______
bb
The offspring in the blue box is
homozygous heterozygous
homozygous
4In 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
B B
b
b
B b
B
B
B b
B
b
B b
b
b
This is the Correct setup Heterozygous
Bb Pure brown bb
homozygous
Another name for pure is _________________
5A o
A AA Ao
B AB Bo
The alleles for blood type show 2 kinds of
inheritance.. The following statements are TRUE
or FALSE?
F A B
are codominant
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
6- 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, its a boy. If the father gives
an X its a girl.
7- If you cross a homozygous RED flowered four
oclock 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
8Red throats (R) are dominant over white
(r) throats in Goonie birds. Make a cross
between a PURE RECESSIVE and a HETEROZYGOUS
Goonie bird.
R r r r
Rr rr Rr rr
50 red throats 50 white throats
- What are the possible phenotypes of their
offspring? - ( and color)
9 B b B b
Black eyes (B) are dominant over red eyes (b) in
rats. Make a cross between two HETEROZYGOUS
rats.
BB Bb Bb bb
- What are the possible phenotypes of their
offspring? - ( and color)
75 black eyes 25 red eyes
10The 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
11- 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
12What kind of cross is this? Pure dominant X pure
recessive Heterozygous X heterozygous Heterozygous
X homozygous Hybrid recessive X hybrid pure
Heterozygous X Homozygous
hybrid
Another name for heterozygous is _______________
13In Reebops curly tails (T) are dominant over
straight tails (t). Make a cross between a
HOMOZYGOUS DOMINANT and a HOMOZYGOUS RECESSIVE
Reebop.
T T t t
Tt Tt Tt Tt
- What is the probability the offspring will have
straight tails? -
0 All will be Curly tailed (Tt)
14What type of gametes can this organism produce?
BbTt ______
______ _______ _______
BT bt bT Bt
What type of gametes can this organism produce?
BBTT ______
______ _______ _______
BT BT BT BT
15TtRr X TtRr
TR Tr tR tr
TR
Tr
tR
tr
TTRR TTRr TtRR TtRr TTRr
TTrr TtRr Ttrr TtRR TtRr
ttRR ttRr TtRr Ttrr ttRr
ttrr
Tall T short t R round
rwrinkled
seeds seeds
16- This is an example of a DIHYBRID cross.
- Which pattern of phenotypes will be seen in the
offspring?
9331
How many offspring will be Short AND Round?
______ Short AND wrinkled? ______
3/16
Recessive and dominant
1/16
Recessive and recessive
HINT9- dominant for both3- recessive and
dominant 3- dominant and recessive 1- recessive
and recessive
17- 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
18A 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
19G g
G GG Gg
g gg
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
20- 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
21- What are the 3 different kinds of inheritance you
learned about?
Dominant/recessive Incomplete dominance Co-dominan
ce
Offspring of the P1 generation are called
______
F1
22What are the possible offspring of a cross
between a blood type AB mom and a type O dad?
A B O O
Ao Bo Ao Bo
- What are the probable blood types of the
offspring?
50 Type A 50 Type B
23- Which of the following crosses would you expect
to see a 9331 ratio in the offspring? - SSYY X ssyy
- SsYy X SsYy
- ssYY X SSyy
SsYy X SsYy 9331 ratio is seen in dihybrid
crosses
24Purple (P)is the dominant color for monsters.
Yellow is recessive (p). Make a cross between a
HOMOZYGOUS purple and a yellow monster.
P P p p
Pp Pp Pp Pp
- What will the offspring be like?
- ( and color)
100 purple
25- 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
26Wilma and Fred are going to have a baby. Fred in
AA and Wilma is oo. What are the possible blood
types of their baby?
A A o o
Ao Ao Ao Ao
100 will have A type blood
27Wilma and Fred are going to have a baby. Fred in
AA and Wilma is oo. What are the possible blood
types of their baby?
A A o o
Ao Ao Ao Ao
100 will have A type blood
28What type of gametes can this organism produce?
RrTt ______
______ _______ _______
RT rt rT Rt
What type of gametes can this organism produce?
WwGg ______
______ _______ _______
WG wg wG Wg
29FILL IN THE BLANKS WITH THE WORDS
Dominant OR Recessive
- 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
Dominant Recessive
Recessive
30T Tall R red t short r white
- 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
3
9
1
31T Tall Y yellow peas t short y green
peas
- 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
3
3
9
32Y yellow peas R red flowers y green
peas r white flowers
- 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
0
16
0