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WorksheetsMendelian and Non-mendelian Genetics
Total questions: 40
Worksheet time: 38mins
Name
Class
Date
1.
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?
a)
100%
b)
75%
c)
50%
d)
25%
2.
One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria?
a)
0%
b)
50%
c)
75%
d)
100%
3.
The observable traits of an organism are known as its
a)
allele
b)
dominance
c)
phenotype
d)
genotype
4.
Each parent contributes one of the genes for a particular trait. The genes of the pair are called:
a)
variables
b)
gametes
c)
hybrids
d)
alleles
5.
Chromosomes that carry genes that code for the same products, such as hemoglobin or eye pigment, are said to be:
a)
homologous
b)
heterozygous
c)
heterogeneous
d)
homozygous
6.
In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are heterozygous for this trait, the percent of offspring expected to exhibit dwarfness is
a)
25%
b)
100%
c)
50%
d)
0%
7.
In dragons, large scales (S) are dominant and small scales (s) are recessive. A dragon that is heterozygous for the trait is crossed with a dragon that has small scales. What should be the ratio of large-scaled dragons to small-scaled dragons among the offspring?
a)
1:2
b)
1:1
c)
2:1
d)
3:1
8.
In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are homozygous for the recessive allele, the percent of offspring expected to exhibit tallness is
a)
25%
b)
75%
c)
100%
d)
0%
9.
The color black is dominant in guinea pigs. The phenotypes of homozygous black guinea pigs and heterozygous black guinea pigs are:
a)
black
b)
gray
c)
BB and Bb
d)
white
10.
Cystic Fibrosis (CF) is a genetic disorder that is controlled by a recessive allele. If a person suffering from CF were to marry an individual who is heterozygous for the trait, what % of their children could be expected to unaffected carriers of the trait? Ignore issues of sterility in persons with CF.
a)
0%
b)
25%
c)
75%
d)
50%
11.
Tay Sachs disease is a fatal genetic disorder. Children born with this disorder generally die before they are five years old. A couple has had three children who died of Tay Sachs. About this couple it can safely be assumed that:
a)
any children they have in the future will also die from this disease
b)
they are both heterozygous for the Tay Sachs trait
c)
they are both homozygous for the Tay Sachs trait
d)
one is heterozygous and the other is homozygous for the Tay Sachs trait
12.
The gene makeup of an organism for a particular trait is known as its
a)
dominance
b)
phenotype
c)
allele
d)
genotype
13.
In pea plants, the allele for green pods (G) is dominant and the allele for yellow pods (g) is recessive. A researcher crosses two green pea plants, and the in F1 generation, all of the offspring exhibit green pods. Can you determine the genotypes of both parents
a)
No, they could be Gg and GG OR GG and GG
b)
Yes, they are Gg and GG
c)
Yes, they are GG and GG
d)
No, they could be Gg and Gg OR GG and Gg
14.
An organism that has two identical genes for a trait is said to be
a)
heterozygous
b)
homozygous
c)
a hybrid
d)
incompletely dominant
15.
Which of these would best be described as a phenotype?
a)
Bb
b)
Pp
c)
brown hair
d)
mutation
16.
When the genotype consists of a dominant and a recessive allele, the phenotype will be like the ______________ allele.
a)
dominant
b)
recessive
c)
both
d)
neither
17.
An allele is a
a)
homozygous genotype
b)
another word for gene
c)
heterozygous genotype
d)
one of several possible forms of a gene
18.
A Heterozygous yellow pea plant's genotype would be:
a)
YY
b)
yy
c)
Yy
d)
Yg
19.
The passing of traits from parents to offspring
a)
Genetics
b)
Geneology
c)
Heredity
d)
Allele
20.
When both alleles of a pair are alike, the organism is said to be
a)
Homozygous
b)
Heterozygous
c)
Homologous
d)
Heterologous
21.
If B=brown & and b=red, what would the genotype(s) be for an individual with brown hair?
a)
bb
b)
Bb
c)
BB
d)
BB and Bb
22.
Your gametes are your:
a)
sperm & egg
b)
body cells
c)
somatic cells
d)
organ and tissue cells
23.
This is the trait that is not visibly expressed, although it is still present in your genes:
a)
homozygous
b)
recessive
c)
dominant
d)
heterozygous
24.
A female guinea pig homozygous dominant for black fur color is mated with a male homozygous for white fur color. In a litter of eight offspring, probability would predict there would be _____.
a)
8 black guinea pigs
b)
4 black and 4 white guinea pigs
c)
2 black, 4 gray, and 2 white guinea pigs
d)
8 white guinea pigs
25.
A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
26.
What type of inheritance do two alleles have if their traits blend together?
a)
Incomplete Dominance
b)
Co-Dominance
27.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
28.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
29.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
30.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XBXB
d)
XbY
31.
Duchenne muscular dystrophy is a recessive x-linked disorder.
According to the Punnett square, what percentage of male offspring will have the disorder?
According to the Punnett square, what percentage of male offspring will have the disorder?
a)
0%
b)
25%
c)
50%
d)
100%
32.
Hemophilia is a recessive x-linked disorder. According to the Punnett square, what percentage of offspring will have the disorder?
a)
0%
b)
25%
c)
50%
d)
100%
33.
This is an example of ___________.
a)
Incomplete Dominance
b)
Codominance
34.
This picture shows what the red blood cell of someone with sickle cell anemia. This disorder is carried on the X chromosome and is most common in sub-saharan populations. What type of inheritance pattern must it follow?
a)
codominance
b)
sex-linked inheritance
c)
multiple allele inheritance
d)
incomplete dominance
35.
This diagram represents what type of inheritance pattern?
a)
sex-linked inheritance
b)
complete dominance
c)
codominance
d)
incomplete dominance
36.
How many phenotypes are there in ABO blood types?
a)
3
b)
4
c)
6
d)
12
37.
What is this tool used for?
a)
to compare DNA of two individuals
b)
read braille
c)
analyze genetic disorders in many generations of individuals
d)
analyze genetic disorders in one individual
38.
ABO blood types are an example of what type of inheritance?
a)
multiple alleles
b)
incomplete dominance
c)
polygenic inheritance
d)
genetic mutations
39.
There are many variations in skin color that can be inherited based on the combination of alleles that you inherit from your mom and dad. This bell curve distribution is an example of
a)
incomplete dominance
b)
codominance
c)
multiple alleles
d)
polygenic inheritance
40.
What is the disorder in this karyotype?
a)
this karyotype is normal
b)
deletion of #5
c)
trisomy 21, down syndrome
d)
Klinefelter's syndrome
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