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WorksheetsGenetics Test Review (ch11 & 14)
Total questions: 67
Worksheet time: 2hrs 44mins
Name
Class
Date
1.
What is a phenotype?
a)
The expression of a trait; physical appearance.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
2.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
3.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
4.
Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75%tall and 25% short
c)
100% tall
5.
R=round seed
r=wrinkled seed.
Cross a homozygous round plant with a wrinkled plant. Which statement predicts the results?
r=wrinkled seed.
Cross a homozygous round plant with a wrinkled plant. Which statement predicts the results?
a)
offspring will be Rr
b)
offspring will be RR
c)
round seeds will be recessive to wrinkled
d)
Wrinkled will be observed in half of offspring
6.
Pea plants can have green or yellow seeds. In a pea plant that is heterozygous for seed color, the allele for yellow seeds masks the effects of the allele of green seeds. Which of the following terms best describes the allele for yellow seeds?
a)
codominant
b)
recessive
c)
dominant
d)
sex-linked
7.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
8.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
9.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
10.
Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.
a)
25%
b)
0%
c)
75%
d)
50%
11.
This type of inheritance pattern shows BOTH traits in hybrid offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
12.
What type of chromosomal abnormality do people with Down Syndrome have?
a)
trisomy 21
b)
monosomy 21
c)
recessive inheritance
d)
dominant inheritance
13.
Trisomy 21 is an example of what type of chromosomal disorder?
a)
crossing over
b)
sex-linkage
c)
nondisjunction
d)
karyotype
14.
The principle (law) of dominance states that
a)
all alleles are dominant
b)
organisms only show dominant traits
c)
some alleles are dominant and others are recessive
d)
all alleles are recessive
15.
In Mendel's P generation, a true-breeding tall plant was crossed with a true-breeding short plant. Short plants reappeared in the F2 generation because
a)
the allele for tallness is dominant
b)
they inherited an allele for shortness and tallness from each parent
c)
the allele for shortness is recessive
d)
the allele for shortness and the allele for tallness segregated when the F1 plants made gametes
16.
When you cross a true-breeding yellow seed plant with true-breeding green seed plant, and all of the resulting offspring are green seed plants, this means
a)
the allele for green seed plants is dominant
b)
the allele for yellow seed plants is dominant
c)
the allele for green seed plants is recessive
d)
they are homozygous like their parents
17.
Punnett squares show all of the following except
a)
the actual results of a cross
b)
all possible genotypes of the offspring
c)
the alleles in the gametes of each parent
d)
all possible phenotypes of the offspring
18.
True-breeding parents for different traits produce offspring that
a)
make up the F2
b)
are hybrids (heterozygous)
c)
are homozygous
d)
are true/pure breeding
19.
A homozygous genotype is all of the following except
a)
two capital letters OR two lowercase letters
b)
two dominant alleles or two recessive alleles
c)
pure/true breeding
d)
hybrid
20.
A heterozygous genotype is all of the following except
a)
one capital letter and one lowercase letter
b)
true-breeding
c)
two different alleles
d)
hybrid
21.
True-breeding means the same as pure-breeding, which means the same as homozygous
a)
true
b)
false
22.
An example of a homozygous dominant genotype would be
a)
tt
b)
TT
c)
Tt
d)
T
23.
An example of homozygous recessive genotype would be
a)
tt
b)
TT
c)
Tt
24.
An example of a heterozygous genotype would be
a)
tt
b)
TT
c)
Tt
d)
hybrid
25.
In fruit flies eye color is carried on the X chromosome. RED is dominant to WHITE. What is the sex and color of the following: XrY
a)
female red
b)
female white
c)
male red
d)
male white
26.
In fruit flies eye color is carried on the X chromosome. RED is dominant to WHITE. What is the sex and color of the following: XRXR
a)
female red
b)
female white
c)
male red
d)
male white
27.
In humans, skin tone is caused by 3 genes, each with 2 alleles. This is an example of
a)
codominance
b)
incomplete dominance
c)
polygenic inheritance
d)
multiple alleles
28.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
29.
Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.
a)
25%
b)
0%
c)
75%
d)
50%
30.
Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.
a)
homozygous / purebred
b)
heterozygous / hybrid
c)
dominant
d)
recessive
31.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
32.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
33.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
34.
B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
35.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
36.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
37.
T = tall an t = short
Both of the geotypes TT and Tt would result in the following phenotype
Both of the geotypes TT and Tt would result in the following phenotype
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
38.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender
d)
all of the above
39.
What is the cause of some traits seeming to "skip" a generation?
a)
dominant traits
b)
recessive traits
c)
mutations
d)
natural selection
40.
If one stronger trait "covers" up another weaker trait, the trait that covers the other is said to be:
a)
Dominant
b)
Heterozygous
c)
Recessive
d)
Hidden
41.
The purpose of selective breeding is to
a)
Get bigger animals
b)
get smaller animals
c)
create animals with desirable traits
d)
create animals with bad traits
42.
When a haploid sperm fertilizes a haploid egg to create a diploid zygote
a)
mitosis
b)
meisosis
c)
replication
d)
fertilization
43.
How many alleles (letters) dooes each person carry for a trait (gene)?
a)
1
b)
2
c)
3
d)
4
44.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
45.
How many alleles does a gamete carry for each gene?
a)
1
b)
2
46.
A human body cell carries ____ chromosomes. A human gamete (sperm or egg) carries ____ chromosomes.
a)
23, 46
b)
46, 23
47.
gametes carry ____ allele(s) for each gene, diploid organisms carry ___ allele(s) for each gene.
a)
1, 2
b)
2, 1
48.
A diploid body cell with the genotype RrYy undergoes meiosis to form gametes. What are all of the possible allelic combinations that can be found in the gametes? (you need to FOIL)
a)
RR, YY, Rr, Yy
b)
Ry and rY
c)
RrYy and RRYY
d)
RY, Ry, rY, ry
49.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
50.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
51.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
52.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
53.
What is the genotypic ratio in this cross?
R= round r= wrinkled
R= round r= wrinkled
a)
3:1 (3 round to 1 wrinkled)
b)
1:2:1 (1 RR, 2 Rr, 1 rr)
c)
75% round, 25% wrinkled
d)
1:3 (1 round to 3 wrinkled)
54.
What is the phenotypic ratio in this cross?
R= round r= wrinkled
R= round r= wrinkled
a)
3:1 (3 round to 1 wrinkled)
b)
1:2:1 (1 RR, 2Rr, 1 rr)
c)
1:3 (1 round to 3 wrinkled)
55.
what other genotype would have the same phenotype as RRYY?
a)
rrYy
b)
Rryy
c)
RrYY
d)
rrYY
56.
Two parents are crossed that are hybrids for two different genes, and the phenotypic ratio in the offspring is 9:3:3:1. This means the two different genes
a)
are linked
b)
are close together on the same chromosome
c)
assort independently
d)
are sex-linked
57.
The law that states that the inheritance of one trait has no effect on the inheritance of another is
a)
the law of independent assortment
b)
the law of dominance
c)
the law of segregation
58.
eye color is an x-linked gene in fruit flies. Red eyes (R) is dominant to white eyes (r). A red eyed male (XRY) is crossed with a white eyed female (XrXr). What are the complete results of the cross? (do a Punnett square)
a)
all females red eyed, all males white eyed
b)
all males red eyes, all females white eyed
c)
50% red, 50% white
d)
50% male, 50% female
59.
Chromosome #s 1-22 are _____, chromosomes #23 are _______.
a)
sex chromosomes, autosomes
b)
haploid, diploid
c)
body cells, sex cells
d)
autosomes, sex chromosomes
60.
linked genes
a)
are close together on the same chromosome
b)
are never seperated
c)
show a 9:3:3:1 phenotypic ratio
d)
assort independently
61.
X-linked recessive genes show up in males more than females because
a)
males have only one X chromosome
b)
males have two copies of the recessive allele
c)
fathers pass on the allele to their sons
62.
Hemophelia is less common in females and more common in males because
a)
the allele for colorblindness is recessive and located on the x chromosome
b)
girls are awesome
c)
boys inherit the X chromosome from their fathers
d)
girls inherit the X chromosome from their fathers
63.
When you are asked a question about sex-linked traits, all of the following are true EXCEPT
a)
you should draw a Punnett square, using XX and XY with the alleles as superscripts (exponents)
b)
half of the offspring will be male and half will be female
c)
dominant alleles get a lowercase letter and recessive alleles get an uppercase letter
d)
males can only inherit an X chromosome from their mother, and a Y chromsome from their father
64.
A couple has 4 girls. What are the odds of the couple having a boy?
a)
1/4
b)
1/5
c)
1/2
d)
1/8
65.
In pedigrees, a circle represents a ______ and a square represents a _____.
a)
male, female
b)
female, male
c)
son, daughter
d)
daughter, son
66.
In a pedigree, a half-filled circle represents a __________.
a)
male carrier (heterozygous)
b)
male
c)
Female carrier (heterozygous)
d)
female
67.
which of the following is a genotype?
a)
tall
b)
Tt
c)
homozygous
d)
recessive
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