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Genetics practice 15 questions

Total questions: 67

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

The trait that will always be expressed if at least one copy of an allele is present.

a)

Recessive

b)

Dominant

c)

DNA

2.

The trait that will be expressed only if two copies of the allele are present.

a)

Recessive

b)

Dominant

c)

DNA

3.

What is it called when a gene carries two different types of alleles?

a)

Homozygous

b)

Heterozygous

c)

Monozygous

d)

Trizygous

4.

What is it called when a gene carries two of the same alleles?

a)

Homozygous

b)

Heterozygous

c)

Monozygous

d)

Mamazygous

5.

Which of the following is heterozygous?

a)

FF

b)

Gg

c)

tt

d)

RR

6.

Which of the following is homozygous recessive?

a)

rr

b)

TT

c)

AA

d)

Ff

7.

Which of the following is homozygous dominant?

a)

Jj

b)

MM

c)

Rr

d)

ee

8.

Which of the following is heterozygous?

a)

AA

b)

Aa

c)

aa

d)

22

9.

Whose discoveries set the foundation for the study of genetics?

a)

Oliver

b)

Taylor

c)

Mendel

d)

Newton

10.

The passing of traits from parents to offspring

a)

heredity

b)

a molecule

11.

The different forms of a gene

a)

alleles

b)

atoms

c)

proteins

d)

wheels

12.

A chart that shows all the possible combinations of alleles that can result from a genetic cross

a)

dominant allele

b)

codominance

c)

probability

d)

Punnett Square

13.

An organism's physical appearance or visible traits. (what it looks like)

a)

phenotype

b)

genotype

14.

An organism's genetic makeup, or allele combination. The letters we use to show the allele combination.

a)

phenotype

b)

genotype

15.

Which genotypes are homozygous dominant?

a)

EE

b)

tt

c)

Rr

d)

Both EE and tt

16.

Which genotypes are heterozygous?

a)

EE

b)

tt

c)

Rr

d)

Both EE and tt

17.
"The Great White Shark was 20 feet in length.  Phenotype or Genotype?
a)
phenotype
b)
genotype
18.
The exact genetic makeup of an organism, such as RR, Tt, PP is its?
a)
phenotype
b)
dominance
c)
genotype
d)
trait
19.
If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?
a)
tall
b)
short
c)
medium
d)
not enough info
20.

Match the following combinations of alleles:

a)

Homozygous dominant

1.

DD

b)

Homozygous recessive

2.

dd

c)

Heterozygous

3.

Dd

21.

Match the following words to the correct definition.

a)

process in sexual reproduction in which male and female reproductive cells join to form a new cell

1.

fertilization

b)

the transfer of pollen from male reproductive structures to female reproductive structure in plants

2.

pollination

c)

cell division that produces reproductive cells in sexually reproducing organisms

3.

meiosis

d)

a reproductive process that involves two parents that combine their genetic material to produce a new organism

4.

sexual reproduction

e)

process in which homologous chromosomes exchange portions of their chromatids during meiosis

5.

crossing over

22.

A ​ (a)   is a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum.

Choose from the below words
zygote
haploid cell
diploid cell
homologous chromosome
23.

A cell containing only one set of chromosomes (n) is called a ​ (a)   ​

Choose from the below words
haploid cell
diploid cell
zygote
homologous chromosome
24.

Chromosomes that have the same sequence of genes and the same structure are called ​ (a)   ​ .

Choose from the below words
homologous chromosomes
haploid cells
diploid cells
zygotes
25.

In monsters, blue hair is dominant to green hair. Which genotype(s) will produce blue hair? (Select ALL that apply)

a)

BB

b)

Bb

c)

bb

26.

Dominant: Freckles (F); Recessive: No freckles (f)

What is the genotype of a person who has freckles? (2)

a)

FF

b)

ff

c)

Ff

27.

Click on the parent genotypes.

A
B
28.

Click on the possible offspring genotypes.

A
B
29.

Match the Punnett square with the correct genotypic ratio.

a)
1.

2 heterozygous : 2 homozygous recessive

b)
2.

1 homozygous dominant : 2 heterozygous : 1 homozygous recessive

c)
3.

4 heterozygous

30.

Label the parent genotypes.

a)homozygous recessive
b)heterozygous
1
2
1)
2)
31.

Match the following combinations of alleles:

a)

Homozygous dominant

1.

DD

b)

Homozygous recessive

2.

dd

c)

Heterozygous

3.

Dd

32.

Aa, DD, Bb, yy are all examples of

a)

genotypes

b)

phenotypes

33.

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a guinea pig with the phenotype: short hair with red eyes (select all possible genotypes)

a)

HHbb

b)

Hhbb

c)

hhBB

d)

HHBb

34.

A person with the genotype BBMm could produce which of the gametes below ...

a)

Bb

b)

BM

c)

bM

d)

Bm

35.

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).


Determine the genotype of a horse with the phenotype: curly maned pacer horse

a)

HhTT

b)

hhTT

c)

hhtt

d)

HHtt

36.

Heterozygous means

a)

The organism has the same genes for the trait

b)

The organism has two different genes for the same trait

c)

The organism really needs to go shopping!

37.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
38.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

39.

Which of the following is the genotype for a purebreed dominant alleles?

a)

ggYy

b)

GGYy

c)

Ggyy

d)

GGYY

40.

In rabbits, grey hair (G) is dominant to white hair (g). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a rabbit with the phenotype: purebred for grey fur with black eyes (select all possible genotypes)

a)

GgBb

b)

GGBb

c)

GGBB

d)

GgBB

41.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
d)
6
42.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

43.

In rabbits, grey hair (G) is dominant to white hair (g). Also, black eyes (B) are dominant to red eyes (b).


Determine the phenotype of a rabbit with the genotype: GGbb

a)

purebred for both traits

b)

purebred grey fur with red eyes

c)

hybrid for both traits

d)

purebred white fur with black eyes

44.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
45.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
46.
Assume mom's gametes are on the left, what is her genotype?
a)
TTZz
b)
TtZz
c)
ttZZ
d)
TtZZ
47.
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? 
a)
0%
b)
25%
c)
50%
d)
100%
48.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
49.

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring represented in this P square will be calico (black and tan spotted)?

a)

25%

b)

50%

c)

75%

d)

100%

50.

Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (WW)? What color are flowers that are RW?

a)

Red and white spotted

b)

Red

c)

Pink

d)

White

51.
A roan cow shows co-dominance in fur color (orange & white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
a)
4: Orange and White
b)
1: Orange : 1 White
c)
2 Orange: 2 Orange and White: 0 White
d)
1: Orange: 2 Orange and White: 1 White
52.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
d)
25%
53.

H= normal blood clotting

h=hemophilia


XHXh x XHY


What is the probability that any of their offspring will have hemophilia?

a)

4/4

b)

3/4

c)

2/4

d)

1/4

54.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

55.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
56.

What would the genotype be of a colorblind male?

a)

XNY

b)

XNYn

c)

XnY

d)

XnYn

57.

The blending of two traits in which one is not completely dominant over the other is known as ---

a)

incomplete dominance

b)

codominance

58.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

59.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

a)

Incomplete dominance

b)

Codominance

60.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be white?

a)

25

b)

50

c)

0

d)

100

61.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be gray?

a)

25

b)

50

c)

75

d)

100

62.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

63.

A woman with curly hair and a man with straight hair produced a child with wavy hair:

a)

Incomplete dominance

b)

Codominance

c)

Complete dominance

64.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
65.

Some flowers are controlled by codominance. Red flowers (FRFR), blue flowers (FBFB) and Speckled flowers (FRFB).


Cross a red flower with a speckled flower. What is the phenotypic ratio?

a)

50% red, 50% speckled

b)

25% red, 25% blue

c)

100% blue

66.

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have red (RR) flowers?

a)

0%

b)

25%

c)

50%

d)

100%

67.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance

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