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Genotype and Phenotype

Total questions: 41

Worksheet time: 10hrs 15mins

Name
Class
Date
1.
Which of the following is heterozygous
a)
FF
b)
tt
c)
Gg
d)
RR
2.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
3.
What does the prefix hetero- in heterozygous mean?
a)
same
b)
different
c)
dating
d)
human
4.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
5.

Genotype and phenotype mean the same thing.

a)

True

b)

False

c)

Who knows?

d)

Who cares?

6.
The physical appearance of an organism based on traits
a)
Genotype
b)
Phenotype
c)
Meiosis
d)
Genetics
7.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
8.
What is a recessive allele?
a)
A trait that is always shown (capital letter)
b)
A trait that can be hidden (lower case letter)
c)
Alleles that are the same
d)
Alleles that are different
9.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?
a)
BB
b)
bb
c)
Bb
d)
bB
10.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's phenotype?
a)
Brown Hair
b)
Blonde Hair
c)
Brown and Blonde Hair
d)
Black Hair
11.
How many letters does a genotype contain?
a)
1
b)
2
c)
3
d)
4
12.
Hair colour is an example of
a)
genotype
b)
phenotype
13.
The physical appearance of a trait is known as the-
a)
genotype
b)
phenotype
c)
characteristics
d)
intelligence
14.
How many letters does a genotype contain?
a)
1
b)
2
c)
3
d)
4
15.
The two-letter code that describes the genetic traits of an organism is called a-
a)
Phenotype
b)
Genotype
c)
Physical Appearance
d)
Intelligence
16.
A section on a chromosome that has genetic information for one trait is called a
a)
gene
b)
allele
c)
phenotype
d)
genotype
17.
the study of heredity
a)
Botany
b)
Astronomy
c)
Genetics
d)
Ecology
18.
How much of your DNA do you inherit from your mom?
a)
10%
b)
25%
c)
50%
d)
it varies
19.

These types of alleles are only expressed if the organism has two copies

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

20.
Recessive Traits show up 
a)
Always
b)
Only when there are two
21.
Dominant Traits show up 
a)
Always
b)
Only when there are two
22.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
23.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
24.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
25.
Look at the picture. The probability that a child will inherit the recessive trait is
a)
25%
b)
50%
c)
75%
d)
100%
26.

An example of a heterozygous gene is

a)

FF

b)

ff

c)

Ff

27.

An example of a homozygous recessive gene is

a)

Dd

b)

DD

c)

dd

d)

DAB

28.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
29.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
30.
If a trait is recessive, it needs to be inherited from ___ parents to be 'expressed'.
a)
one
b)
both
31.

Punnett Square

a)

a genetic factor that blocks another genetic factor

b)

a genetic factor that is blocked by the presence of a dominant factor

c)

physical appearance of a trait

d)

a model used to predict possible genotypes and phenotypes of offspring

32.

Physical appearance of a trait

a)

gene

b)

allele

c)

genotype

d)

phenotype

33.

Which of the following genotypes is homozygous recessive?

a)

Tt

b)

tt

c)

TT

d)

tT

34.

Dominant traits are traits that are ______________.

a)

Weak

b)

Strong

c)

Invisible

35.

Which of the following shows homozygous dominant trait?

a)

Cc

b)

dd

c)

DD

d)

dD

36.

Which of the following may shows the recessive trait of an organism?

a)

Rr

b)

RR

c)

rR

d)

rr

37.

Brown hair is an example of which of the following

a)

Genotype

b)

Phenotype

c)

Neither

38.

Which of the following is an example of a homozygous genotype?

a)

Rr

b)

rr

c)

NN

d)

Nr

39.

Which of the following is an example of an allele?

a)

H

b)

HH

c)

Hr

d)

RRR

40.

If your genotype is Bb, what type of trait would you express as a phenotype?

a)

Dominant

b)

Recessive

c)

Both the dominant and recessive traits

41.

A heterozgous genotype results in what type of expression of phenotype?

a)

Recessive Phenotype

b)

Dominant Phenotype

c)

Both traits being expressed

d)

Completely new traits

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