1. GENETICS Practice Chapter 9

2. G g G g GG Gg gg ¾ or 75% The parents in this cross are _____________
Homozygous Heterozygous G g GG Gg gg
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%

3. B b
The genotype of the offspring in the blue box is _______ bb
The offspring in the blue box is
homozygous heterozygous
homozygous

4. Another name for pure is _________________
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
This is the
Correct setup
Heterozygous = Bb
Pure white = bb
Another name for pure is _________________
homozygous

5. A o AA Ao B AB Bo
The alleles for blood type show 2 kinds of inheritance..
The following statements are TRUE or FALSE? F
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 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, it’s a boy.
If the father gives an X; it’s a girl.

7. 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

8. Red throats (R) are dominant over white (r) throats in Goonie birds.
R r r
Red throats (R) are dominant over white (r)
throats in Goonie birds.
Make a cross between a PURE RECESSIVE and a HETEROZYGOUS Goonie bird.
Rr rr
Rr rr
50% red throats
50% white throats
What are the phenotypes of their offspring?
(% and color)

9. Black eyes (B) are dominant over red eyes (b) in rats.
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 phenotypes of their offspring?
(% and color)
75 % black eyes
25% red eyes

10. What would a blood cell from a person with B type blood look like?
A person with this phenotype could
have 2 possible genotypes.
______ _______
B o B B

11. 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

12. 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

13. hybrid 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

14. In 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
Tt Tt
Tt Tt
What % of the offspring will have straight tails? 0%
All will be Curly tailed (Tt)

15. TR Tr tR tr TtRr X TtRr Tall = T short = t R= round r=wrinkled
TTRR TTRr TtRR TtRr
TTRr TTrr TtRr Ttrr
TtRR TtRr ttRR ttRr
TtRr Ttrr ttRr ttrr
Tall = T short = t R= round r=wrinkled
seeds seeds

16. How many offspring will be Short AND Round? ______ 3/16
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
1/16
Recessive and recessive
HINT: 9- dominant for both 3- recessive and dominant
3- dominant and recessive
1- recessive and recessive

17. What would a blood cell from a person with A type blood look like?
A person with this phenotype could
have 2 possible genotypes.
______ _______
A o A A

18. What do we call the offspring of the F1 generation?
Which of the following genotypes could be from a HOMOZYGOUS RECESSIVE organism?
TT bb Rr Ww tt XX aa
bb tt aa

19. 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

20. G g GG Gg gg Green pods 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

21. 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

22. What would a blood cell from a person with AB type blood look like?
A person with this phenotype would
have this genotype.
______
A B

23. 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

24. What are the possible offspring of a cross between a blood type AB mom and a type O dad?
Ao Bo
Ao Bo
What will the % and blood type of the offspring be?
50% Type A
50% Type B

25. 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

26. Purple (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
Pp Pp
What will the offspring be like?
(% and color)
100% purple

27. What would a blood cell from a person with O type blood look like?
A person with this phenotype would
have this genotype.
______
o o

28. 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

29. Type _____ blood is called the
Type ____ blood is called the “Universal Donor” because in an emergency it can be given to people with ALL blood types. (A,B,O,AB) AB
Type _____ blood is called the
“Universal recipient” because it can receive blood from all of the different
Blood types.