Download PRACTICE TEST CHAPTER 11 ______ 1. Different forms of a gene

Name ____________________________
PRACTICE TEST CHAPTER 11
Period ____ Date __________ Seat ____
______
1.
Different forms of a gene are called
a.
______
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
b. actual outcome of a cross
d. result of meiosis
genetics
b. heredity
c. phenotype
d. genotype
complete dominance
polygenic dominance
b. codominance
d. multiple alleles
one haploid gamete
four diploid gametes
b. three diploid gametes
d. four haploid gametes
It doubles
b. It stays the same
c. It halves
d. It becomes diploid
3:1
b. 1 : 3 : 1
c. 1 : 2
d. 3 : 4
prophase I
b. metaphase I
c. anaphase I
D. telophase II
Two pink-flowering plants are crossed. The offspring flower as follows: 25% red, 25% white,
and 50% pink. What pattern of inheritance does flower color in these flowers follow?
a.
______
probable outcome of a cross
result of incomplete dominance
During which phase of meiosis is the chromosome number reduced?
a.
______
d. dominant
Which phenotypic ratio did Mendel find in his F2 Generation from the parental cross TT x tt?
a.
______
c. homozygous
What happens to the chromosome number during meiosis?
a.
______
b. heterozygous
Unlike mitosis, meiosis in male mammals results in the formation of
a.
c.
______
hybrid
A situation in which a gene has more than two alleles is known as
a.
c.
______
d. recessive factors
The physical characteristics of an organism are called its
a.
______
c. dominant factors
A Punnett square is used to determine the
a.
c.
______
b. alleles
Organisms that have two identical alleles for a particular trait are said to be
a.
______
hybrids
dominance
b. multiple alleles
c. polygenic traits
d. incomplete dominance
c. gametes
d. phenotype
The genetic makeup of an organism is its
a.
heredity
b. genotype
PRACTICE TEST CHAPTER 11
______
12.
Alleles are first separated from each other during the process of
a. cytokinesis
______
13.
b. meiosis I
c. meiosis II
D. metaphase II
Which of the following is NOT one of Gregor Mendel’s principles?
a.
b.
c.
d.
The alleles for different genes usually segregate independently.
Some forms of a gene may be dominant.
The inheritance of characteristics is determined by factors (genes).
Crossing-over occurs during meiosis.
Questions 14-16
The Punnett square below shows a cross between two pea plants each with round seeds.
______
14.
15.
R
RR
Rr
R
RR
Rr
b. RRrr
c. rr
d. RR
Which statement is true about the cross in the Punnett square?
a.
b.
c.
d.
______ 16.
?
The unknown genotype is
a. Rr
______
?
Both parents are heterozygous for the trait.
Both parents are homozygous for the trait.
One parent is heterozygous and the other is homozygous for the trait.
The trait is controlled by codominant alleles.
What percentage of the offspring of this cross will produce round sees?
a.
0%
b. 25%
c. 50%
d. 100%
17. Suppose Mendel crossed two pea plants and got both purple and white flowers. What could
have been the genotypes of the two original plants? What genotype could not have been present.
PRACTICE TEST CHAPTER 11
18. In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r).
A heterozygous guinea pig and a homozygous recessive guinea pig have a total of nine offspring. Is
it possible for all of the offspring to have smooth coats? Explain your answer.
In pea plants, the coat, or covering, of the seed is either smooth or wrinkled. Suppose a researcher has two
plants—one that makes smooth seeds and another that makes wrinkled seeds. The researcher crosses the
wrinkled-seed plants and the smooth-seed plants, obtaining the following data. Use the data to answer
questions 19 and 20.
19. Mendel knew that the allele for smooth (R) seeds was dominant over the allele for wrinkled (r) seeds.
If this cross was Rr x rr, what numbers would fill the middle column?
RESULT OF SEED EXPERIMENT
Phenotype
Number of Plants in the F1 Generation
Expected
Observed
Smooth seeds
63
Wrinkled seeds
69
20. Are the observed numbers consistent with the hypothesis that the cross is Rr x rr? Explain your answer.
PRACTICE TEST CHAPTER 11
Questions 21 and 22 refer to Figure 11-1.
Chromosomes are made of many genes linked together. Gene maps, like the one shown in figure 11-1, show
how far apart these genes are from each other. For example, the alleles for black body and reduced bristles are
located close together, while the alleles for dumpy wing and brown eye are farther apart.
21. Which trait is most likely linked to having speckled wings in the fruit fly in Figure 11-1? Explain why.
22. Which trait is least likely to be linked to having speckled wings in the fruit fly? Explain why.
Exact Location on Chromosome
Chromosome 2
0.0
1.3
13.0
Star eye
Dumpy wing
31.0
Dachs (short legs)
48.5
51.0
Black body
Reduced bristles
54.5
55.0
Purple eyes
Light eye
67.0
75.5
Vestigial (small) wing
Curved wing
99.2
104.5
107.0
Arc (bent wings)
Brown eye
Speckled wing
10
20
30
40
50
60
70
80
90
100
110
23. Make a diagram illustrating how crossing-over occurs between the chromatids of homologous
chromosomes.