Download Genetics˙Practice Name: Date - Hatboro

Genetics_Practice
Date:
Name:
1.
The diagram below shows the chromosomes from a cell after they were photographed under a microscope.
Which of the following questions may best be answered by studying an organism's chromosomes?
2.
A.
What sex is the organism?
B.
Is the organism endangered?
C.
Where is the organism's ecosystem?
D. How does the organism obtain its food?
In phenylketonuria (PKU), an enzyme that converts one amino acid into another does not work properly. Which of
the following is the most likely cause of this genetic condition?
A.
an error in the transcription of the gene for the enzyme
B.
a mutation in the DNA sequence that codes for the enzyme
C.
an excess of the amino acids necessary to produce the enzyme
D. a structural variation in the amino acid modi ed by the enzyme
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Genetics_Practice
3.
The diagram below represents DNA ngerprints which are the result of gel electrophoresis done on several DNA
samples found at a crime scene.
Which suspect is linked to the crime scene by this DNA analysis?
A.
Suspect A
B.
Suspect B
C.
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Suspect C
D. Suspect D
Genetics_Practice
4.
The picture below shows two mature plants.
The two plants were cross-pollinated and each plant produced seeds. Which statement most likely describes a
characteristic of the o spring that will grow from the seeds produced by each plant?
A.
The o spring will grow taller than the parent plants.
B.
The o spring will have healthier leaves than the parent plants.
C.
The o spring will produce fewer owers than the parent plants.
D. The o spring will have light-colored owers like the parent plants.
5.
If Jessica has light eyes (bb) and both of her parents have dark eyes (Bb) which statement is true?
A.
Jessica inherited both genes from her father.
B.
Jessica inherited both genes from her mother.
C.
Jessica inherited one recessive form of the gene from each parent.
D. Jessica inherited one dominant form of the gene from each parent.
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Genetics_Practice
6.
The gure below shows a Punnet Square for an inherited trait.
The arrow is pointing to a circled genotype in the square. What genotype does the circled “dd” represent?
A.
the genotype in the mother's egg
B.
the genotype that only the girls will inherit
C.
the genotype that any of the children could inherit
D. the genotype that exactly
7.
1
4
of the children will inherit
In fruit ies, gray body color (G) is dominant over black body color (g). What kind of o spring would you expect
from parents who are both heterozygous for body color (Gg Gg)?
G
g
G
g
A.
0% gray, 100% black
B.
25% gray, 75% black
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C.
75% gray, 25% black
D. 100% gray, 0% black
Genetics_Practice
8.
In human beings, earlobes can be free or attached. Some people can roll their tongues while others cannot.
The genotype and phenotype of two parents are shown below.
Which trait cannot be transferred by this mother?
A.
9.
B.
Attached earlobes
C.
Cannot roll tongue
D. Can roll tongue
Which trait will all of the o spring of the cross shown above exhibit?
A.
10.
Free earlobes
Can roll tongue
B.
Cannot roll tongue
C.
Attached earlobes
Children would not be able to roll their tongues if they inherited a
A.
t allele from both parents
B.
T allele from both parents
C.
T allele from the mother and the t allele from the father
D. t allele from the mother and the T from the father
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.
D. Free earlobes
Genetics_Practice
11.
The gures below represent two chromosomes from an animal.
Using the table below that describes the traits carried on Chromosome #6, which trait can the animal inherit only
from its mother?
Genes on
Chromosome #6
H
long hair
h
short hair
B
b
A.
12.
long hair
Trait
black hair
white hair
B.
black hair
C.
white hair
D. short hair
The diagram below represents a cell. The letters in the diagram represent alleles for two di erent genetic traits.
According to Mendel's law of independent assortment, which of the following shows all of the allele combinations
expected in gametes produced by this cell?
13.
A.
B.
C.
D.
Which of the following terms applies to traits, such as human eye color, that are controlled by more than one gene?
A.
codominant
B.
polygenic
C.
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recessive
D. sex-linked
Genetics_Practice
14.
In a certain variety of chicken, some o spring have a feather pattern that is black-and-white checkered. Chickens
with this checkered feather pattern result from the cross of a black chicken with a white chicken.
Which of the following types of inheritance is most likely responsible for the checkered feather pattern?
A.
15.
codominant
B.
dominant
C.
polygenic
D. sex-linked
Two chromosome pairs from a diploid organism are shown below.
Assuming meiosis and fertilization occur normally, which of the following pairs of alleles can an o spring receive
from this parent?
A.
16.
A and A
B.
A and a
C.
A and f
D. F and F
Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb
marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children?
A.
0% Hh : 100% hh
B.
50% Hh : 50% hh
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C.
75% Hh : 25% hh
D. 100% Hh : 0% hh
Genetics_Practice
17.
The diagram below shows the pedigree of an individual with hemophilia, a sex-linked recessive condition. The
diagram also shows how hemophilia is passed to o spring on an X chromosome.
Hemophilia Pedigree
Which statement explains why few females in the family have the condition?
A.
Males have two X chromosomes.
B.
C.
Females have a Y chromosome.
D. Males have a dominant Y chromosome.
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Females have two X chromosomes.
Genetics_Practice
18.
The diagram below represents a cross between two pea plants.
In pea plants, the allele for round seeds (R) is dominant to the allele for oval seeds (r). In a cross between the two
plants above, what percentage of the o spring will have round seeds?
A.
19.
100%
B.
75%
C.
50%
D. 25%
In pigeons, the allele for normal feathers (F) is dominant to the allele for frizzy feathers (f).
If a purebred, normal-feathered bird (FF) is crossed with a frizzy-feathered bird ( ), how many di erent feather
phenotypes are possible in the o spring?
A.
20.
1
B.
2
C.
3
Which of the following best describes the inheritance of a sex-linked trait?
A.
a recessive allele carried by females that a ects only males
B.
a dominant allele carried by females that a ects only males
C.
an allele carried on the Y chromosome that can a ect both males and females
D. an allele carried on an X chromosome that can a ect males or females
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D. 4
Genetics_Practice
21.
If a corn plant has a genotype of Ttyy, what are the possible genetic combinations that could be present in a single
grain of pollen from this plant?
A.
22.
B.
TY, ty
C.
TY, Ty, ty
D. Ty, ty, tY, TY
In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal hearing is due
to its dominant allele (D). What percentage of the o spring of a normal heterozygous (Dd) dog and a deaf dog
(dd) would be expected to have normal hearing?
A.
23.
Ty, ty
0%
B.
25%
C.
50%
D. 100%
Fur color in cats is controlled by an autosomal gene that can occur in the dominant form, (B), or the recessive
form, (b). The length of the cat's fur is controlled by another autosomal gene that occurs in the dominant form,
(S), or the recessive form, (s). The table below shows the traits for these allele codes.
The following genotypes were found in a male cat and a female cat.
BbSs (male) bbSS (female)
Which one of the following choices is true of the phenotype of o spring from these parents?
24.
A.
All o spring will have black fur.
B.
All o spring will have white fur.
C.
All o spring will have long-haired fur.
D. All o spring will have short-haired fur.
A healthy individual is a carrier of a lethal allele but is una ected by it. What is the probable genotype of this
individual?
A.
two dominant normal alleles
B.
one recessive lethal allele and one dominant lethal allele
C.
one recessive lethal allele and one dominant normal allele
D. one dominant lethal allele and one recessive normal allele
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Genetics_Practice
25.
The pedigree below shows the occurrence of red-green colorblindness in four generations of a family. Use the
information in the pedigree to answer the following question(s).
Hemophilia A, a blood disorder, is inherited in a similar way to red-green colorblindness. Therefore, hemophilia
most often results when the a ected gene is passed from
A.
26.
father to son
B.
father to daughter
C.
mother to son
D. mother to daughter
In Pisum sativum, a pea plant, the allele for yellow seed color (Y) is dominant over the allele for green seed color
(y). Two plants were crossed; three-fourths of the o spring plants had yellow seeds, and one-fourth of the o spring
plants had green seeds. Based on these results, what were the genotypes of the parent plants?
A.
Yy, yy
B.
Yy, Yy
C.
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YY, yy
D. YY, Yy
Genetics_Practice
27.
28.
In dogs, brown fur (B) is dominant to white fur (b). A dog has a litter of 12 puppies of which 6 are brown and 6
are white. Which of these Punnett squares shows the cross that occurred?
A.
B.
C.
D.
Individuals within a population of rabbits have di erent colors of fur as shown in the diagram below.
The di erence in the fur color of the individual rabbits is described as
A.
29.
speciation
B.
variation
C.
evolution
D. succession
A scientist crossed a tall pea plant with a short pea plant. All of the four hundred o spring produced were tall
pea plants.
Which of these explains these results?
A.
The allele for tall pea plants is dominant.
B.
C.
The allele for short pea plants is dominant.
D. The o spring inherited a new mutation.
page 12
The o spring are homozygous dominant.
Genetics_Practice
30.
In humans, the allele for dimples (D) is dominant. The allele for not having dimples (d) is recessive. A woman
(DD) and a man (Dd) have four children. Which of these is the predicted ratio of the children with dimples to the
children without dimples?
A.
31.
32.
33.
1:0
B.
1:1
C.
1:3
D. 3 : 1
Which of these best describes the correct sequence in the expression of a trait?
A.
trait ! gene ! enzyme
B.
gene ! protein ! trait
C.
protein ! gene ! trait
D. gene ! trait ! DNA
Which statement best describes a dominant gene?
A.
It is the gene that produces mutations.
B.
It is the gene that produces desirable traits.
C.
It is the gene that masks a recessive gene.
D. It is the gene that is masked by a recessive gene.
Red-green color blindness a ects about 7.0% of the human male population. It a ects approximately 0.4% of the
human female population. These data suggest that red-green color blindness is a
A.
dominant trait carried on the Y chromosome
B.
C.
recessive trait carried on the Y chromosome
D. recessive trait carried on the X chromosome
page 13
dominant trait carried on the X chromosome
Genetics_Practice
34.
Use the information and the pedigree below to answer the following question(s).
In humans, the allele for having feet with normal arches is dominant (A).The allele for at feet is recessive (a).
The pedigree below shows the occurrence of normal arches and at feet in four generations of a family. In
the pedigree, individuals are identi ed by the generation and individual numbers. For example, Individual 2 in
Generation I is identi ed as I-2.
PEDIGREE FOR INHERITANCE OF NORMAL ARCHES
Which of these individuals in the pedigree is a male with the genotype aa?
A.
35.
Individual I-1
B.
Individual II-2
C.
Individual III-2
D. Individual III-5
Individuals III-6 and III-7 have two children and are expecting a third child. Their two children have
What is the chance that the third child will have normal arches?
A.
25%
B.
50%
C.
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75%
D. 100%
at feet.
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Genetics_Practice
04/08/2013
1.
Answer:
A
21.
Answer:
A
2.
Answer:
B
22.
Answer:
C
3.
Answer:
C
23.
Answer:
D
4.
Answer:
D
24.
Answer:
C
5.
Answer:
C
6.
Answer:
C
7.
Answer:
C
8.
Answer:
D
9.
Answer:
25.
26.
27.
28.
Answer:
B
29.
Answer:
A
D
30.
Answer:
A
10.
Answer:
A
31.
Answer:
B
11.
Answer:
A
32.
Answer:
C
12.
Answer:
C
33.
Answer:
D
13.
Answer:
B
34.
Answer:
D
14.
Answer:
A
35.
Answer:
C
15.
Answer:
C
16.
Answer:
B
17.
Answer:
B
18.
Answer:
B
19.
Answer:
A
20.
Answer:
D