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WorksheetsGenetics
Total questions: 29
Worksheet time: 35mins
Name
Class
Date
1.
What describes the physical appearance of a trait?
a)
allele
b)
genotype
c)
phenotype
d)
karyotype
2.
If alleles look like Aa in a genotype it is said to be
a)
homozygous
b)
heterozygous
c)
incomplete dominant
d)
codominant
3.
If alleles look like AA in a genotype it is said to be
a)
homozygous
b)
heterozygous
c)
incomplete dominant
d)
codominant
4.
Trait will always show up in an organism if the allele is present
a)
recessive
b)
dominant
c)
incomplete dominant
d)
codominant
5.
This all is covered up when a dominant allele is present
a)
recessive
b)
dominant
c)
incomplete dominance
d)
co-dominant
6.
What shows the possible combinations of alleles that can result from a genetic cross?
a)
bar graph
b)
pie chart
c)
punnett square
d)
co-dominant graph
7.
If two heterozygous tall plants are crossed, and tall is dominant. What would be your expected phenotypes?
a)
100% tall
b)
75% tall, 25%short
c)
50% tall, 50%short
d)
25% tall, 75% short
8.
Unattached earlobes (E) is dominant. Attached earlobes (e) is recessive. A woman with the genotype (Ee) and a man with the genotype (ee) have a child. What is the probability that the child is heterozygous?
a)
0%
b)
25%
c)
50%
d)
75%
9.
If the allele for gray fur (G) is dominant to the allele for white fur (g) in mice, What will be the ratio if you cross a heterozygous gray mouse with a white mouse?
a)
3GG : 0Gg : 1gg
b)
2GG : 1Gg : 1gg
c)
1GG : 2Gg : 1gg
d)
0GG : 2Gg : 2gg
10.
If a purebred, normal feathered bird (FF) is crossed with a frizzy-feathered bird (ff) how many different phenotypes would you have?
a)
1
b)
2
c)
3
d)
4
11.
Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?
a)
100% hairless stems
b)
100% hairy stems
c)
50% hairy stems : 50% hairless stems
d)
75% hairy stems : 25% hairless stems
12.
In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?
a)
0BB : 2Bb : 2bb
b)
1BB : 2Bb : 1bb
c)
2BB : 0Bb : 2bb
d)
2BB : 1Bb : 0bb
13.
What is going to be the genotype that is missing?
a)
AABb
b)
AABB
c)
AAbb
d)
aaBB
14.
The genetic makeup of an organism or what represents the letters in a Dihybrid Cross
a)
allele
b)
genotype
c)
phenotype
d)
karyotype
15.
In rabbits, there are four different versions of the gene for coat color. What pattern of inheritance is this?
a)
incomplete dominance
b)
co-dominance
c)
polygenic inheritance
d)
multiple alleles
16.
What trait, dominant or recessive, will be expressed if an organism has one dominant allele and one recessive allele?
a)
Dominant
b)
Recessive
c)
Both dominant and recessive will be expressed.
d)
The organism will lack the trait completely.
17.
The physical characteristics of an organism are called its ____________, whereas the genetic characteristics of an organism are called its ____________.
a)
alleles; phenotype
b)
genotype; phenotype
c)
heredity; genotype
d)
phenotype; genotype
18.
There are genetic crosses in which neither of two alleles is dominant over the other. In these crosses, the phenotype is a blend of the two alleles. These crosses are described as
a)
Codominant
b)
Incomplete dominance
c)
Polygenic inheritance
d)
Multiple alleles
19.
An experiment crosses an F1 generation of red-flowered (RR) plants and white-flowered (WW) plants. What is the color of the F2 generation if the allele for color is characteristic of incomplete dominance?
a)
Blue
b)
White and Blue stripes
c)
Red and White spots
d)
Pink
20.
What is this chart and what is it showing?
a)
The chart is a karyotype showing trisomy 21.
b)
The chart is a pedigree showing trisomy 21.
c)
The chart is a chromosome map showing trisomy 21.
d)
The chart is a cladogram showing trisomy 21.
21.
What is the phenotype ratio of the cross shown in this punnet square?
a)
9:3:3:1
b)
16:0
c)
3:1
d)
4:4:4:4
22.
A man has blood type A (heterozygous) and a woman has blood type B (heterozygous). What are the possible blood types of their kids?
a)
A or B only
b)
AB only
c)
A, B, AB only
d)
A, B, AB, or O
23.
If a woman is a carrier for a sex linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true? Make a punnett square!
a)
All sons will have hemophilia
b)
all daughters will have hemophilia
c)
50% of daughters and 50% of sons have hemophilia
d)
100% of sons have hemophilia and 100% of daughters are carriers
24.
This pedigree chart is showing what type of inheritance?
a)
Sex linked
b)
Incomplete dominance
c)
Multiple Alleles
d)
Recessive traits inheritance
25.
In the Punnett square shown, which of the following is true about the offspring resulting from the cross?
a)
About half are expected to be short.
b)
All are expected to be short.
c)
About three fourths are expected to be tall.
d)
All are expected to be tall.
26.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be
a)
Black
b)
White
c)
Gray
d)
Speckled
27.
In pea plants, gray seed color (G ) is dominant over white seed color (g) and smooth pod shape (S) is dominant over constricted pod shape (s). A plant that has the genotype GGss is crossed with a plant that has the genotype GgSs. What is the probability of having offspring with the genotype Ggss?
a)
0%
b)
10%
c)
25%
d)
50%
28.
A woman has type B blood and her husband has type O blood. What must be the woman's genotype, if they have a child with type O blood?
a)
BO
b)
BB
c)
OO
d)
type B
29.
In fruit flies, eye color is a sex linked trait. Red is dominant to white. What would be the percentages of offspring of a cross of a white eyed female with a red-eyed male?
a)
1 female white eyes, 1 female red-eyes, 1 male white eyes, 1 male red-eyes
b)
2 female red eyes, 2 males white eyes
c)
2 female white eyes, 2 males red eyes
d)
2 female red eyes, 1 male red eyes, 1 male white eyes
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