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WorksheetsIntroduction to Genetics
Total questions: 60
Worksheet time: 1hrs 23mins
Name
Class
Date
1.
Different forms of genes:
a)
alleles
b)
phenotype
c)
genotype
d)
homologous chromosomes
2.
An organism's appearance or other observable characteristics:
a)
phentoype
b)
genotype
c)
recessive
d)
dominant
3.
Having two of the SAME alleles for a trait (example HH or hh):
a)
homozygous
b)
heterozygous
c)
recessive
d)
dominant
4.
What do the letters inside the grid of a Punnett square represent?
a)
phenotypes of parents
b)
genotypes of offspring
c)
testcrosses of offspring
d)
chromosomes of parents
5.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
6.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
7.
Mendel's law of segregation states that during meiosis, the alleles that control each trait separate, and only _________________ from each pair is/are passed to the offspring
a)
one allele
b)
the dominant trait
c)
two alleles
d)
the recessive trait
8.
A distinguishing characteristic that can be inherited is a(n)
a)
cross
b)
allele
c)
gene
d)
trait
9.
In plants, tall (T) is dominant over short (t).
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
You must show your work for full credit!
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
You must show your work for full credit!
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
10.
In plants, being short is the recessive gene.
Two heterozygous plants are crossed. What is the phenotypic ratio of the offspring?
You must show your work for full credit!
Two heterozygous plants are crossed. What is the phenotypic ratio of the offspring?
You must show your work for full credit!
a)
1 TT : 2 Tt : 1 tt
3 tall; 1 short
3 tall; 1 short
b)
1 Tall : 2 Medium : 3 Short
100% tall
100% tall
c)
3 TT : 1 tt
2 tall; 2 short
2 tall; 2 short
d)
3 Tall : 1 Short
100% short
100% short
11.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
12.
Which is the correct phenotype for this organism?
a)
BB
b)
blue
c)
green
d)
bb
13.
What is the genotype for this organism?
(E= 3 eyes, e= 1 eye)
(E= 3 eyes, e= 1 eye)
a)
EE
b)
Ee
c)
ee
d)
EE or Ee
14.
B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?
a)
BB x Bb
b)
BB x bb
c)
Bb x Bb
d)
Bb x bb
15.
If something is heterozygous, it is also...
a)
purebred
b)
hybrid
c)
dominant
d)
recessive
16.
This image shows a...
a)
Punnett Square
b)
Phenotype
c)
Genotype
d)
Dominant allele
17.
What does a Punnett Square help you do?
a)
Determine the ratio of phenotypes
b)
Determine the ratio of genotypes
c)
Predict possible traits the offspring will have
d)
All of the above
18.
Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
19.
Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
20.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
21.
Which represents the genotype of a homozygous condition?
a)
Bb
b)
BC
c)
bb
d)
bc
22.
A cross of a red cow with a white bull produces all road offspring. This type of inheritance is known as
a)
codominance
b)
incomplete dominance
c)
multiple alleles
d)
"breed time:
23.
A woman with blood genotype I(A)i marries a man with blood genotype I(B)i. What is the probability that they would have a child with type O blood?
a)
1/1
b)
1/2
c)
1/3
d)
1/4
24.
If the four existing children in a family are all sons, what chance would there be that the next child would also be a son?
a)
75%
b)
50%
c)
25%
d)
20%
25.
In screech owls, red feathers are dominant over gray feathers. If two heterozygous red-feathered owls are mated, what percentage of their offspring would be expected to have red feathers?
a)
25%
b)
50%
c)
75%
d)
100%
26.
A person with type O blood marries a person with type AB blood. Possible blood genotypes of their children are
a)
I(A)i and I(B)I(B)
b)
I(B)I(B) and I(A)I(A)
c)
I(A)i and I(B)i
d)
I(A)I(B) and ii
27.
Gregor Mendel is often called _____________. This is due to his experiments with pea plant genetics.
a)
The Father of Heredity
b)
The King of Peas
c)
The Father of Genetics
d)
The Father of Modern DNA
28.
Heredity can be defined as
a)
A characteristic that an organism can pass onto its offspring through its genes.
b)
the passing of traits from parent to offspring.
c)
the scientific study of phenotypes.
d)
none of the answers are correct.
29.
What organism did Mendel do his famous studies of genetics with?
a)
bees
b)
carrots
c)
peas
d)
mice
30.
bb crossed with BB, what is the probability of Bb?
a)
0%
b)
25%
c)
50%
d)
100%
31.
Refer to the illustration. The child in box 1 in the Punnett square would
a)
be homozygous for freckles
b)
have an extra freckles chromosome
c)
be heterozygous for freckles
d)
not have freckles
32.
What part of an organism's genetic makeup is received from its mother?
a)
25%
b)
50%
c)
75%
d)
100%
33.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
34.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
35.
Magda is a tall, 11 year old drummer. She has a scar on her right cheek. She is good at swimming. Which of her traits did Magda most likely inherit?
a)
height
b)
the scar
c)
ability to swim
d)
ability to play drums
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.
When a first-generation plant self-pollinates, what is the ratio of dominant to recessive traits in the second-generation plants?
a)
1:3
b)
3:1
c)
1:4
d)
4:1
38.
How can two parents with brown eyes have a child with blue eyes?
a)
The parents may both have recessive genes for blue eyes.
b)
The child was born at sea on a cruise ship
c)
Eye color in humans is not an inherited trait
d)
The child was deprived of oxygen during its birth
39.
Mendel's 2nd law, which states that factors controlling different characteristics are inherited independently of one another is called the law of:
a)
Judge Dredd
b)
independent assortment
c)
segregation
d)
domination
40.
Mendel's 1st law says that there are 2 factors controlling a given characteristic, one of which is dominant and one which is recessive, and these factors separate and go to different gametes during meiosis. This law is shortened to just be called the law of:
a)
separation
b)
segregation
c)
flatulation
d)
inheritance
41.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
42.
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
43.
What percentage of the offspring will have this recessive disease?
a)
0%
b)
25%
c)
50%
d)
75%
44.
Looking at this pedigree, how many family members have the disease?
a)
4
b)
7
c)
All
d)
None
45.
How many PAIRS of sex chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
46.
What is the purpose of using a pedigree?
a)
To determine the average age of a family
b)
To find out family histories and medical records
c)
To find out whether a couple can have a boy or a girl
d)
To trace the inheritance of a certain trait through generations
47.
Mike has type O blood. Mike can receive blood from someone who has Type A or Type B.
a)
True
b)
False
48.
What is NOT a possible genotype for someone with type B blood?
a)
BB
b)
AB
c)
BO
49.
What are the blood types of the possible children that a woman (type O) and man (type AB) can have?
a)
O and AB
b)
O and A
c)
O and B
d)
A and B
50.
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
51.
What type of inheritance is determined by multiple genes located at different loci on different chromosomes and there can be a range of traits?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
52.
What pattern of inheritance is shown in this image?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
53.
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
54.
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%
55.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
56.
The range of human skin colors is caused by a variety of genes, each of which has at least 2 alleles. This is an example of:
a)
incomplete dominance
b)
codominance
c)
multiple alleles
d)
polygenic inheritance
57.
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)
all black
b)
all white
c)
all gray
d)
speckled black and white
58.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
a)
0/16
b)
4/16
c)
8/16
d)
16/16
59.
Traits are often inherited but can be influenced by the environment. Which of the following is most likely one of these traits
a)
widow's peak
b)
eye color
c)
Albinism
d)
intelligence
60.
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
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