KEY FOR QUIZ 2:
Genotype and Phenotype
Anna Blight
Topic # 3033
1.
(True/False) The alleles for coat color are located on the chromosomes.
T
2.
(T/F) Each pair of genes carries several pairs of chromosomes.
F
3.
(T/F) Only turkeys have less pairs of chromosomes than humans.
F (swine)
4.
Genetic information is transmitted in what fashion?
A:
B:
C:
D:
5.
DNA to RNA to proteins
proteins to DNA to RNA
RNA to DNA to proteins
DNA to RNA to genes
If the genotype of a steer is AA, he is:
A:
B:
C:
D:
heterozygous
homozygous recessive
homozygous dominant
heterozygous dominant
6. A hog is Ss for spots and is crossed with another Ss sow. What is the probability that
offspring will be heterozygous? Show your work in a Punnett square provided on
page 3.
A:
B:
C:
D:
7.
25%
75%
50%
50:50
What is the phenotypic ratio for the above mating?
A:
B:
C:
D:
3:1
1:2:1
50:50
2:1
8. A lamb has black wool and has parents that are white. If W=white and w=black, what
is the genotype of the parents?
A:
B:
C:
D:
WW & ww
Ww & Ww
50:50
75:25
9. If these two parents mate again, what are the chances they would produce another
black lamb?
A:
B:
C:
D:
10.
0
25%
50 %
75%
You have decided to mate a heterozygous ram with a homozygous recessive ewe.
If W=white and w=black, what genotype are the lambs? Show your work in the
Punnett square on page 3.
A:
B:
C:
D:
100% heterozygous
50% homozygous recessive & 50% heterozygous
50 % white & 50% black
50% heterozygous recessive & 50% homozygous
Bonus point: If you mate one of the black lambs from the above mating with another
heterozygous ram, what will be the phenotypic ratio of the next generation? Show your
work in the Punnett square on page 3.
1:1 or 50% white to 50% black.
6. Punnett square
S
s
S
SS
Ss
s
Ss
ss
10. Punnett square
W
w
w
Ww
ww
w
Ww
ww
Bonus Punnett square
W
w
w
Ww
ww
w
Ww
ww