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-Genetics Unit Test Study Guide
Matching
Match each item with the correct statement below.
a. phenotype
e. cross-pollination
b. Punnett square
f. probability
c. homozygous
g. genotype
d. heterozygous
____
____
____
____
____
____
____
1.
2.
3.
4.
5.
6.
7.
occurs when a plant pollinates a different kind of plant
a plant with one dominant and one recessive gene
formed from both inherited alleles
the mathematical chance that something will happen
an organism’s appearance
a plant with either two dominant or two recessive genes
used to organize possible offspring combinations
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
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8. What is a plant that has two dominant genes or two recessive genes called?
a. genotype
c. organism
b. homozygous
d. heterozygous
9. This diagram is used to trace a trait through generations of a family.
a. generation square
c. meiosis
b. pedigree
d. selective breeding
10. When a plant fertilizes itself, it is called a(n)
a. allele plant.
c. true-breeding plant.
b. cross-pollinating plant.
d. self-pollinating plant.
11. How are sex cells different from other human cells?
a. Sex cells have more chromosomes.
b. Sex cells have half as many chromosomes.
c. Sex cells are larger.
d. Sex cells have no chromosomes.
12. What are homologous chromosomes?
a. chromosomes that carry different sets of genes
b. chromosomes that are large
c. chromosomes that carry the same set of genes
d. chromosomes that are small
13. Instructions for an inherited trait are called
a. albinism.
c. alleles.
b. phenotype.
d. genes.
14. A plant with two dominant OR two recessive alleles is said to be
a. heterozygous.
c. cross-pollinating.
b. true breeding.
d. homozygous.
15. What is a phenotype?
a. the way an organism feels
c. a group of 5 alleles
b. a dominant gene
d. the way an organism looks
____ 16. Why do sex-linked disorders occur more often in males?
a. Males have two Y chromosomes.
b. Males have two X chromosomes.
c. Males have only one X chromosome.
d. Males have two X and two Y chromosomes.
____ 17. What is heredity?
a. plants that are cross-pollinated
b. traits passing from offspring to parents
c. traits passing from parents to offspring
d. the ratio of dominant to recessive traits
____ 18. Offspring that are different from both parents are produced by
a. sexual reproduction.
c. something going wrong.
b. mitosis.
d. asexual reproduction.
____ 19. What is it called when cells are copied with half the number of chromosomes?
a. a nucleus
c. meiosis
b. sex cells
d. mitosis
____ 20. When there is incomplete dominance,
a. the alleles have no influence.
b. one allele has more influence than the others.
c. there are no alleles present.
d. each allele has its own degree of influence.
____ 21. The different forms of a gene that decide a characteristic are known as
a. genes.
c. alleles.
b. albinism.
d. phenotypes.
Problem
Use the figure below to answer the following questions.
22. In which box is Pp?
23. In which box is PP?
24. In which box is pp?
Use the figure below to answer the following questions.
25. Look at the table. What is this table called?
a.
P-grid
c.
b.
dominance chart
d.
heredity map
Punnett square
26. Look at the table. What is the probability that the offspring will be pp?
a.
25%
c.
75%
b. 50%
d.
100%
27. Look at the diagram. If purple (P) is dominant, and white (p) is recessive, what color will one out of every
four of the offspring be?
a.
purple
c.
purple with white edges
b. white
d. lavender (white and purple mix)
Genetics Unit Test
Answer Section
MATCHING
1.
2.
3.
4.
5.
6.
7.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
E
D
G
F
A
C
B
STA:
STA:
STA:
STA:
STA:
STA:
STA:
S7L3.a
S7L3.a
S7L3
S7L3.a
S7L3.a
S7L3.a
S7L3.a
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
STA:
S7L3.a
S7L3
S7L3.a
S7L3.a
S7L3.a
S7L3.a
S7L3.a
S7L3
S7L3
S7L3.a
S7L3
S7L3
S7L3
S7L3
MULTIPLE CHOICE
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
B
B
D
B
C
D
D
D
C
C
A
C
D
C
PROBLEM
22. ANS:
B
STA: S7L3
23. ANS:
A
STA: S7L3
24. ANS:
C
STA: S7L3.a
25. ANS:
D
STA: S7L3.a
26. ANS:
A
STA: S7L3.a
27. ANS:
B
STA: S7L3.a
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