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Genetics - Monohybrid Simple Dominance

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

How is it possible for traits to skip generations?

a)

the trait is dominant

b)

the trait is recessive

c)

the trait is weak

d)

the trait is caused by a random mutation

2.

Which of the following parents would both show the dominant phenotype but still be able to have a baby that is recessive for a trait?

a)

AA x Aa

b)

Aa x aa

c)

AA x aa

d)

Aa x Aa

3.

Select the following option(s) that is/are considered to be homozygous.

a)

BB

b)

Bb

c)

bb

4.

What does it mean for a trait to be considered "dominant"

a)

The dominant trait wins with just one allele present

b)

The dominant trait wins only when two alleles are present

c)

A dominant trait is when the two alleles are the same

d)

A dominant trait is when the two alleles are different

5.

Select the following option(s) that is/are considered to be heterozygous.

a)

BB

b)

Bb

c)

bb

6.

What is considered to be the phenotype?

a)

Double stranded chromosomes

b)

The physical trait that is expressed

c)

The combination of genes

d)

All of the genetic information

7.

Select the following options that represent a genotype.

a)

Rr

b)

Round peas

c)

Smooth peas

d)

rr

8.

What is another term for heterozygous?

a)

Hybrid

b)

Mixed

c)

Differentiated

d)

Same

9.
Who is the father of genetics? 
a)
Charles Darwin 
b)
Gregor Mendel
c)
Dimitri Mendeleev 
d)
Hans Krebs 
10.
Recessive alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
11.
Which of the following is a genotype?
a)
long hair
b)
blue eyes
c)
Gg
d)
tall
12.
Aa is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
13.
bb is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
14.
Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?
a)
100% Pp (purple)
b)
50% Pp (purple); 50% pp (white)
c)
75% Pp (purple); 25% pp (white)
d)
25% PP, 50% Pp, 25% pp
75% purple, 25% white
15.
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
16.
Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?
a)
100% Gg
b)
50% GG, 50% Gg
c)
25% GG, 50% Gg, 25% gg
d)
75% Gg, 25% gg
17.

The physical expression of a genetic trait is called a

a)

mutation

b)

genotype

c)

crossing over

d)

phenotype

18.

The following items are examples of __________.

Items: eye color, hair color, height

a)

homozygous alleles

b)

genotype

c)

heterozygous alleles

d)

phenotype

19.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
20.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
21.
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
22.
Which of the following genotypes would be considered heterozygous?
a)
BB
b)
gg
c)
Ff
d)
TT
23.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
24.

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? (B=brown eyes and b=blue eyes)

a)

0 %

b)

25%

c)

50%

d)

75%

25.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
26.

Which is heterozygous ?

a)

Tt

b)

TT

27.
Which is homozygous ?
a)
Zz
b)
SS
28.

Which of the following traits of a dog is inherited from its parents?

a)

the presence of fleas in its fur

b)

the color of its fur

c)

the ability to sit up and beg

d)

the habit of barking to go outside

29.
An allele whose trait always shows up in the organism when the allele is present.
a)
recessive allele
b)
dominant allele
c)
hidden allele
d)
present allele
30.
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
31.

If two parents are heterozygous for being tall, then the parents genotypes are

a)

TT

b)

Tt

c)

tt

32.
In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?
a)
GG
b)
Gg
c)
gg
d)
green
33.
In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?
a)
0%
b)
25%
c)
75%
d)
100%
34.
One of the two forms of a gene is called a(n)
a)
genotype
b)
allele
c)
hybrid
d)
trait
35.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
36.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
37.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
38.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
39.
aa always shows up as
a)
dominant
b)
recessive
40.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
41.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
42.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
43.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
44.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
45.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
46.
the physical characteristics that result from genes
a)
phenotype
b)
genotype
c)
heterozygous
d)
homozygous
47.

If a homozygous dominant allele (AA) is crossed with a homozygous recessive allele (aa), all of the resulting offspring will be

a)

Homozygous dominant

b)

Heterozygous

c)

Homozygous Recessive

48.

In guinea pigs, the allele for short hair is dominant. If all the guinea pigs are born short haired what are the possible genotypes of the parents? (There are two possible combinations.)

a)

Ss + Ss

b)

SS + SS

c)

SS + Ss

d)

ss + ss

49.
Why is crossing over important?
a)
Increases the number of genes that can be inherited
b)
Increases genetic variation
c)
Decreases the occurrence of genetic diseases
d)
Decreases the number of genes that can be inherited
50.

Your genes are a part of your ______ which is/are found on __________.

a)

chromosomes; DNA

b)

genetics; heredity

c)

DNA; chromosomes

d)

heredity; genetics

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