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Genetics Practice

Total questions: 42

Worksheet time: 22mins

Name
Class
Date
1.

Which of the following is heterozygous?

a)

MM

b)

Mm

c)

mm

2.

Which of the following is homozygous dominant?

a)

RR

b)

Rr

c)

rr

3.

Which of the following is homozygous recessive?

a)

PP

b)

Pp

c)

pp

4.

What term denotes the physical expression of a gene?

a)

genotype

b)

phenotype

c)

appearance

d)

homologous

5.

Which term denotes the combination of genes an organism has?

a)

genotpye

b)

phenotype

c)

heterozygous

d)

homozygous

6.

Which of the following would produce a recessive phenotype?

a)

hh

b)

Rr

c)

Ww

d)

BB

7.

Which of the these is homozygous?

a)

gg

b)

Yy

c)

Nn

d)

Ee

8.

What word would be INCORRECT to describe "QQ"

a)

homozygous

b)

dominant

c)

genotype

d)

recessive

9.
Are recessive traits shown with capital or lowercase letters? 
a)
Capital
b)
Lowercase
10.
The mathematical chance that something will happen is known as...
a)
chance
b)
luck
c)
probability
11.
The different forms of genes are known as
a)
environment
b)
probability
c)
traits
d)
alleles
12.
Two different genes for a trait (sometimes called hybrid). Bb
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
13.

What would the ratio for genotypes be for this Punnett Square?

a)

2/4 Bb:2/4 bb

b)

2/4 BB:2/4 Bb

c)

1/4 BB:2/4 Bb:1/4 bb

d)

4/4 Bb

14.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
15.
A homozygous dominant round seeded plant is crossed with a homozygous recessive wrinkled seeded plant. What are the genotypes of the parents?
a)
RR X rr
b)
Rr X rr
c)
rr X rr
d)
RR X Rr
16.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
17.
bb is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
18.
Aa is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
19.
Recessive alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
20.
AA is an example of 
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
21.
Which of the following is a genotype?
a)
long hair
b)
blue eyes
c)
Gg
d)
tall
22.
Dominant alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
23.
Which of the following is a phenotype?
a)
AA
b)
AB
c)
black fur
d)
Tt
24.
Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?
a)
100% tall
b)
50% tall, 50% short
c)
75% tall, 25% short
d)
25% tall, 75% short
25.

An organism with two different alleles for a trait is said to be:

a)

recessive

b)

heterozygous

c)

dominant

d)

homozygous

26.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
27.
Different forms of genes:
a)
alleles
b)
phenotype
c)
genotype
d)
homologous chromosomes
28.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
29.

When is a recessive allele expressed in offspring?

a)

when two copies are present

b)

when a parent has no dominant alleles

c)

when the offspring is heterozygous

d)

when one copy is present

30.

Recessive alleles may not be expressed because they are

a)

masked (covered) by a dominant allele

b)

the least common allele in a population.

c)

the most common allele in a population.

d)

less likely to have crossing over.

31.
B=brown eyes
b= blue eyes
What is true about these 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
32.
Which of the following genotypes would be considered heterozygous?
a)
BB
b)
gg
c)
Ff
d)
TT
33.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
34.

An organism's genetic makeup

a)

phenotype

b)

genotype

c)

heterzygous

d)

allele

35.

Which is heterozygous ?

a)

Tt

b)

TT

36.
Which is homozygous ?
a)
Zz
b)
SS
37.
Brown (B) is dominant over white (b). Which genotype is a purebred for brown fur?
a)
BB
b)
Bb
c)
bb
d)
All of the above
38.
 Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
39.
 Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
40.
A cross of a Green chicken (GG) with a white chicken (WW) produces all speckled offspring (GGWW). This type of inheritance is known as
a)
incomplete dominance
b)
polygenic inheritance.
c)
codominance
d)
multiple alleles.
41.
These are used to predict the outcomes of crosses.
a)
Punnett Squares
b)
karyotypes
c)
line graphs
d)
pedigrees
42.
What type of inheritance do two alleles have if their traits blend together? 
a)
Incomplete Dominance
b)
Co-Dominance

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