Name: ______________________ Class: _________________ Date: _________
ID: A
10.3 Honors Biology Questions
____
____
1. A cross of a black chicken (CBCB) with a white chicken (CWCW) produces all “blue” offspring
(CBCW). This type of inheritance is known as
a. intermediate inheritance.
b. polygenic inheritance.
c. codominance.
d. multiple alleles.
2. Variation in human skin color is a result of
a. intermediate inheritance.
b. codominance.
c. polygenic inheritance.
d. multiple alleles.
____
3. If blue Andalusian chickens are mated, according to the idea of intermediate inheritance, 25% of the
offspring are expected to be blue. _________________________
____
4. Blood type in humans is determined by a single gene that has multiple alleles.
_________________________
Short Answer
5. What is polygenic inheritance? Give two examples.
1
Name: ______________________
ID: A
Other
USING SCIENCE SKILLS
Figure 10-4
6. What do the letters R and I represent in Figure 10-4?
.
7. In Figure 10-4, what is the genotype of the red-flowered snapdragons?
.
8. Explain whether the alleles in Figure 10-4 show dominance, intermediate inheritance, or codominance.
.
9. According to Figure 10-4, if red-flowered snapdragons and ivory-flowered snapdragons are crossed,
what percentage of their offspring would be expected to be pink-flowered?
.
2
Name: ______________________
ID: A
10. According to Figure 10-4, if two pink-flowered snapdragons are crossed, what percentage of their
offspring would be expected to be pink-flowered?
.
11. How can environmental conditions affect phenotype expression?
.
12. Explain the difference between intermediate inheritance and codominance.
3
ID: A
10.3 Honors Biology Questions
Answer Section
MULTIPLE CHOICE
1. ANS:
OBJ:
2. ANS:
OBJ:
C
10.3.1
C
10.3.3
PTS:
NOT:
PTS:
NOT:
1
core
1
core
DIF:
Below average/Average
DIF:
Average/Above average
DIF:
Average/Above average
MODIFIED TRUE/FALSE
3. ANS: F, 50%
PTS:
NOT:
4. ANS:
OBJ:
1
core
T
10.3.2
PTS: 1
OBJ: 10.3.1
DIF:
Below average/Average
NOT: core
SHORT ANSWER
5. ANS:
Polygenic inheritance is a situation in which two or more genes affect a single character. Two
examples in humans are height and skin color.
PTS: 1
NOT: core
DIF:
Below average/Average
OBJ: 10.3kt
OTHER
6. ANS:
R represents the allele for red flowers. I represents the allele for ivory flowers.
PTS: 1
DIF: Below average/Average
7. ANS:
The genotype of the red-flowered snapdragons is RR.
OBJ: 10.3.1
PTS: 1
DIF: Below average/Average
OBJ: 10.3.1
8. ANS:
The alleles show intermediate inheritance, because a cross between red-flowered snapdragons and
ivory-flowered snapdragons produces snapdragons with an in-between trait—pink flowers.
PTS:
1
DIF:
Average/Above average
1
OBJ: 10.3.1
ID: A
9. ANS:
One hundred percent of the offspring would be expected to be pink-flowered.
PTS: 1
DIF: Average/Above average
OBJ: 10.3.1
10. ANS:
Fifty percent of the offspring would be expected to be pink-flowered.
PTS:
1
DIF:
Average/Above average
OBJ: 10.3.1
ESSAY
11. ANS:
The product of a genotype is generally not a single, rigidly defined phenotype, but a range of
possibilities influenced by the environment. For example, in humans, nutrition affects height, exercise
affects build, and exposure to sunlight darkens the skin.
PTS: 1
DIF: Below average/Average
OBJ: 10.3.4
NOT: core
12. ANS:
In intermediate inheritance, one allele is not completely dominant over another. As a result, the
heterozygous phenotype is intermediate between the two homozygous phenotypes. In codominance,
both alleles are dominant. As a result, the heterozygous phenotype is a combination of each
homozygous phenotype.
PTS:
1
DIF:
Below average/Average
2
OBJ: 10.3kt