1. GENETICS Practice

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

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 _________________ homozygous
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 B b B b B b B b
This is the
Correct setup
Heterozygous = Bb
Pure brown = bb
Another name for pure is _________________
homozygous

5. 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.

6. 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 possible phenotypes of their offspring?
(% and color)

7. 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 possible phenotypes of their offspring?
(% and color)
75 % black eyes
25% red eyes

8. 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

9. 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

10. 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
hybrid
Another name for heterozygous is _______________

11. In Reebops curly tails (T) are dominant over straight tails (t).
2/24 Warm-up
Write in Journal under “Minion Baby Genetics”
T T t
In Reebops curly tails (T) are dominant over straight tails (t).
Make a cross between a HOMOZYGOUS DOMINANT and a HOMOZYGOUS RECESSIVE Reebop.
Tt Tt
Tt Tt
What is the probability the offspring will have straight tails? 0%
All will be Curly tailed (Tt)

12. What 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

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

21. 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

22. 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

23. 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

24. o Ao Ao 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?
A A o
Ao Ao
100% will have A type blood

25. o Ao Ao 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?
A A o
Ao Ao
100% will have A type blood

26. What 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

27. Dominant Dominant Recessive Recessive
FILL 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

28. 3 3 9 T = 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

29. 1 3 3 T = 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

30. 16 Y = 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 16

31. 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

32. 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 & 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