NEW
Font size
S
M
L
XL
WorksheetsGenetics
Total questions: 54
Worksheet time: 3hrs 14mins
Name
Class
Date
1.
In peas, the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seeds is dominant (Y) and the trait for green seeds is recessive (y).
A cross between two plants results in 292 tall, yellow plants and 103 short, green plants. What are the most likely genotypes of the parents?
A cross between two plants results in 292 tall, yellow plants and 103 short, green plants. What are the most likely genotypes of the parents?
a)
TtYY x Ttyy
b)
TTYy x TTYy
c)
TTyy x TTYy
d)
TtYy x TtYy
2.
Suppose that in sheep, a dominant allele (B) produce black hair and a recessive allele (b) produce white hair. If you saw a black sheep, you would be able to identify
a)
its phenotype for hair color
b)
its genotype for hair color
c)
the genotype of only one of its parents
d)
the phenotype of both of its parents
3.
One of the main reasons genes assort independent of one another is that
a)
they produce unrelated traits
b)
they produce related traits
c)
they are on the same chromosome
d)
they are on different chromosomes.
4.
A single gene has 3 or more alternative forms. These are called
a)
heterozygotes
b)
multiple alleles
c)
epistatic
d)
polygenic
5.
A child has type O blood, if mother has type A blood, what would the fathers blood type be
a)
A,B, or O
b)
AB or A
c)
AB or B
d)
O only
6.
In mice, the homozygous mice are black and white. The heterozygous mice are gray. What pattern of inheritance is expressed in fur color in mice?
a)
complete dominance and recessiveness
b)
co-dominance
c)
incomplete dominance
d)
pleiotropy
7.
If the parents of a cross are AaBcCc x aaBBcc. What is the probability of an offspring that is homozygous recessive for all 3 traits?
a)
1/64
b)
1/32
c)
1/8
d)
O
8.
Red x white = pink
What is the genotype of the pink flower?
What is the genotype of the pink flower?
a)
RR
b)
rr
c)
Rr
d)
Can't be determined
9.
Males are represented by squares on a pedigree.
a)
true
b)
false
10.
Blood type AB
a)
epistasis
b)
codominance
c)
incomplete dominance
d)
hybrid vigor
11.
A child born with blood type O could have parents with all of the following blood types except...?
a)
A and B
b)
A and O
c)
A and A
d)
AB and O
12.
In the second generation-how many people have the disease?
a)
2
b)
4
c)
6
d)
8
13.
How many people in this whole pedigree have the trait/disease?
a)
2
b)
3
c)
4
d)
6
14.
Freckles (F) are dominant over nonfreckles. What is the phenotype of individual #3
a)
Ff
b)
ff
c)
freckles
d)
nonfreckles
15.
What is the relationship between person I 1 and III 2?
a)
Father and Son
b)
Father and Daughter
c)
Grandfather and Granddaughter
d)
Uncle and Niece
16.
How many individuals are there in the 3rd generation?
a)
2
b)
3
c)
4
d)
6
17.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
18.
Give the genotype for person III-3
a)
GG
b)
Gg
c)
gg
d)
G
19.
Which two individuals have hitchhiker's thumbs?
a)
III-2 and III-3
b)
IV-1 and IV-3
c)
I-1 and I-2
d)
III-2 and IV-2
20.
What is the genotype for individual IV-3?
a)
TT
b)
Tt
c)
tt
d)
T_
21.
What does this represent?
a)
Not Affected (homozygous dominant) Male
b)
Not Affected (homozygous dominant) Female
c)
Affected (homozygous recessive) Male
d)
Affected (homozygous recessive) Female
22.
What does this represent?
a)
Not affected (homozygous dominant) Female
b)
Not affected (homozygous dominant) Male
c)
Affected (homozygous recessive) Male
d)
Affected (homozygous recessive) Female
23.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
24.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
25.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
26.
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
27.
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
28.
If T=Tall & t=short, what is the genotypic ratio?
a)
1:3
b)
3:1
c)
1:2:1
d)
2:2
29.
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%
30.
A corn plant heterozygous for tall sprouts mates with a corn plant with short sprouts. If tall sprouts are dominant, how many different phenotypes are possible in the offspring?
a)
1
b)
2
c)
3
d)
4
31.
If a Homozygous red snapdragon and a Heterozygous pink snapdragon were crossed - what percentage of the offspring would be homozygous white?
a)
0%
b)
25%
c)
50%
d)
75%
32.
A heterozygous yellow pea plant's genotype would be:
a)
YY
b)
yy
c)
Yy
d)
Yg
33.
Which process and type of resulting cells are represented?
a)
mitosis, gametes
b)
mitosis, body cells
c)
meiosis, gametes
d)
meiosis, body cells
34.
Red/green color blindness is a recessive trait. A woman who is a carrier for this allele marries a normal-vision male. What is the probability that they will have a child who is color blind?
a)
1/4
b)
1/2
c)
3/4
d)
1
35.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
36.
What is a phenotype?
a)
The expression of a trait; what you see.
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
37.
The inherited combination of alleles is known as the offspring's
a)
heredity
b)
phenotype
c)
genotype
d)
redigree
38.
An organism's appearance is known as its
a)
heredity
b)
phenotype
c)
genotype
d)
pedigree
39.
B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
b= blue eyes
What is true about 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
40.
In certain rats, black fur is dominant over white fur. If two rats, both heterozygous for fur color are mated, their offspring would be expected to have
a)
four different genotypes and two different colors
b)
two different genotypes and three different colors
c)
three different genotypes and two different colors
d)
three different genotypes and three different colors
41.
Which of the following genotypes is homozygous recessive?
a)
RR
b)
Rr
c)
rr
d)
None of the Above
42.
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%
43.
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%
44.
Pairs of genes that control the same trait are known as
a)
allelles
b)
gametes
c)
hybrids
d)
loci
45.
A cross between two tall garden pea plants produced 314 tall plants and 98 short plants. What genotypes are the parents?
a)
TT and tt
b)
TT and Tt
c)
Tt and Tt
d)
TT and TT
46.
Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
47.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
48.
Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
49.
Another word for homozygous is...
a)
purebred
b)
hybrid
c)
heterozygous
d)
dominant
50.
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
51.
True/False: Different genotypes can code for the same phenotype.
a)
True
b)
False
52.
If something is heterozygous, it is also...
a)
purebred
b)
hybrid
c)
dominant
d)
recessive
53.
Which of the following terms refers to the different possibilities of a gene?
a)
chromosome
b)
DNA
c)
Punnett Squares
d)
allele
54.
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
Reset
