Genetic Rev 1
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____
1. A Punnett square shows you all the ways in which ____ can combine.
a. alleles b. eggs c. sperm d. colors
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2. Mendel called plants that received different alleles for a trait from each parent ____.
a. hybrids b. dominant c. genotypes d. phenotypes
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3. In a Punnett square, a capital letter stands for a ____ allele.
a. recessive b. dominant c. homozygous d. heterozygous
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4. Of the following, which represents a homozygous recessive genotype?
a. TT b. Tt c. tt d. TTT
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5. Which term refers to physical characteristics that are studied in genetics?
a. traits b. offspring c. generations d. hybrids
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6. The different forms of a gene are called
a. alleles. b. factors c. masks. d. traits.
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7. Scientists call an organism that has two different alleles for a trait a
a. hybrid. b. cross. c. purebred. d. factor.
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8. What does the notation TT mean to geneticists?
a. two dominant alleles b. two recessive alleles c. at least one dominant allele d. one dominant and one
recessive allele
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9. What does the notation tt mean to geneticists?
a. two dominant alleles b. two recessive alleles c. at least one dominant allele d. one dominant and one
recessive allele
____ 10. What does the notation Tt mean to geneticists?
a. two dominant alleles b. two recessive alleles c. at least one recessive allele d. one dominant allele and
one recessive allele
____ 11. What was the probability of Mendel 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 d. four in four
____ 12. 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 d. all of Mendel's discoveries about genetic crosses
____ 13. If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the
probability that an offspring will have black fur?
a. 25 percent b. 50 percent c. 75 percent d. 100 percent
____ 14. An organism's physical appearance is its
a. genotype. b. phenotype. c. codominance. d. probability.
____ 15. An organism's genotype is its
a. genetic makeup. b. feather color. c. physical appearance. d. stem height.
____ 16. An organism that has two identical alleles for a trait is
a. codominant. b. hybrid. c. homozygous. d. heterozygous.
____ 17. 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. d. two
different alleles for a trait.
____ 18. What does codominance mean in genetics?
a. Both alleles for a trait are dominant. b. Both alleles for a trait are recessive. c. The alleles for a trait are
neither dominant nor recessive. d. Each allele for a trait is both dominant and recessive.
____ 19. What happens during meiosis?
a. Each sex cell loses half of its chromosomes. b. Chromosome pairs separate to form new sex cells.
c. Each sex cell copies itself to form four new chromosomes.
____ 20. When sex cells combine to produce offspring, each sex cell contributes
a. one fourth of the normal number of chromosomes. b. half the normal number of chromosomes. c. the
normal number of chromosomes. d. twice the normal number of chromosomes.
____ 21. The genetic code is the
a. order of nitrogen bases along a gene. b. number of nitrogen bases in a DNA molecule. c. order of amino
acids in a protein. d. number of guanine and cytosine bases in a chromosome.
____ 22. The order of the bases along a gene determines the order in which
a. sugars are put together to form a carbohydrate. b. genes are arranged on a chromosome. c. amino acids
are put together to form a protein. d. chromosomes are arranged in the nucleus.
____ 23. Where does protein synthesis take place?
a. in the ribosomes in the nucleus of the cell b. on the ribosomes in the cytoplasm of the cell c. in the
chromosomes in the nucleus of the cell d. on the chromosomes in the cytoplasm of the cell
____ 24. A mutation is any change
a. that is harmful to an organism. b. in a gene or chromosome. c. that is helpful to an organism. d. in the
phenotype of a cell.
Genetic Rev 1
Answer Section
MULTIPLE CHOICE
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ANS:
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STO:
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STO:
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STO:
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A
A
B
C
A
A
TEKS 8.11C
A
TEKS 8.11C
A
TEKS 8.11C
B
TEKS 8.11C
D
TEKS 8.11C
C
TEKS 8.11C
A
TEKS 8.11C
D
TEKS 8.11C
B
A
C
D
C
B
B
A
C
B
B
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
B
B
B
B
Low/Mid
Low/Mid
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
3/1
STO:
2/1
STO:
3/1
STO:
3/1
STO:
Grade 8 Ch. 16.1.1
Grade 8 Ch. 16.1.2
DIF: Mid/High
OBJ: Grade 8 Ch. 16.1.2
DIF: Low/Mid
OBJ: Grade 8 Ch. 16.1.3
DIF: Low/Mid
OBJ: Grade 8 Ch. 16.1.3
DIF: Mid/High
OBJ: Grade 8 Ch. 16.1.3
DIF: Mid/High
OBJ: Grade 8 Ch. 16.2.1
DIF: Low/Mid
OBJ: Grade 8 Ch. 16.2.2
DIF: Mid/High
OBJ: Grade 8 Ch. 16.2.2
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
DIF:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
OBJ:
Low/Mid
Low/Mid
Mid/High
Mid/High
Mid/High
Mid/High
Low/Mid
Low/Mid
Mid/High
Low/Mid
Mid/High
Grade 8 Ch. 16.2.3
Grade 8 Ch. 16.2.3
Grade 8 Ch. 16.2.3
Grade 8 Ch. 16.2.3
Grade 8 Ch. 16.2.3
Grade 8 Ch. 16.3.2
Grade 8 Ch. 16.3.2
Grade 8 Ch. 16.4.1
Grade 8 Ch. 16.4.1
Grade 8 Ch. 16.4.2
Grade 8 Ch. 16.4.3
7.4, 7.10, 7.10A, 7.10C
7.3E, 7.10, 7.10C
7.4, 7.10, 7.10A, 7.10C
7.4, 7.10, 7.10A, 7.10C