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Genetics Test
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question. (1 point each)
____
1. Factors that control traits are called
a. genes.
b. purebreds.
c. recessives.
____
2. Scientists call an organism that has two different alleles for a trait a
a. hybrid.
b. trait.
c. purebred.
____
3. What does the notation TT mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. at least one dominant allele
____
4. What does the notation Tt mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. one dominant allele and one recessive allelle
____
5. What is probability?
a. the actual results from a series of events
b. the likelihood that a particular event will occur
c. the way the results of one event affect the next event
____
6. What is the probability of producing a tall plant from a genetic cross of two hybrid tall plants?
a. one in four
b. two in four
c. three in four
____
7. What does a Punnett square show?
a. all the possible outcomes of a genetic cross
b. only the dominant alleles in a genetic cross
c. only the recessive alleles in a genetic cross
____
8. An organism’s physical appearance is its
a. genotype.
b. phenotype.
c. codominance.
____
9. What does codominance mean in genetics?
a. Both alleles are dominant.
b. Both alleles are recessive.
c. The alleles are neither dominant nor recessive.
____ 10. When sex cells combine to produce offspring, each sex cell will contribute
a. one fourth of the normal number of chromosomes.
b. half the normal number of chromosomes.
c. the normal number of chromosomes.
____ 11. Which term refers to physical characteristics that are studied in genetics?
a. traits
b. offspring
c. generations
____ 12. The different forms of a gene are called
a. alleles.
b. factors.
c. masks.
____ 13. An organism’s genotype is its
a. genetic makeup
b. feather color
c. physical appearance
____ 14. An organism that has two identical alleles for a trait is
a. heterozygous.
b. tall.
c. homozygous.
____ 15. A heterozygous organism has
a. three different alleles for a trait.
b. two identical alleles for a trait.
c. only one allele for a trait.
Completion
Complete each sentence or statement. (1 point each)
WORD BANK:
Meiosis
gene
allele
g
r
chromosomes
0
25
50
100
16. Two alleles combine to form one ____________________.
17. If G represents the dominant allele of a gene, then ____________________ represents the recessive allele.
18. A chart used to predict results of genetic crosses is known as a(n) ____________________.
19. In a cross between two hybrid Tt pea plants, ____________________ percent of the offspring will be Tt.
20. Genes are located on strand-like structures called ____________________.
Short Answer
Use the diagram to answer each question. (2 points each)
21. What percent of offspring in the first Punnett square will have white flowers?
22. What percent of the offpsring in the second Punnett square will have white flowers?
Genetics Test
Answer Section
MULTIPLE CHOICE
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15.
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A
A
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D
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COMPLETION
16.
17.
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20.
ANS:
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gene
g
Punnett square
50
chromosomes
SHORT ANSWER
21. ANS:
100
22. ANS:
75