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Genetics Review

Total questions: 53

Worksheet time: 55mins

Name
Class
Date
1.

In a Punnett square, a lower case letter stands for a ____________ allele.

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

2.

Hair color, height, eye color and freckles are examples of human traits. What do we call the physical expression of the genetic material of an organism?

a)

genetics

b)

heredity

c)

genotype

d)

phenotype

3.

In animals, shaggy fur is dominant to short fur. The Punnett Square shows the genotypes of the offspring of a shaggy fur animal and a short fur animal. What were the genotypes of the parents?

a)

FF and FF

b)

Ff and ff

c)

ff and ff

d)

Ff and Ff

4.

In animals, shaggy fur is dominant to short fur. According to the genotypes shown, what percent of offspring will have short fur?

a)

0

b)

25

c)

50

d)

75

e)

100

5.
In a punnet square where are the parent alleles written?
a)
Top and inside the boxes
b)
Only on the left and right side of the boxes. 
c)
outside of the boxes (top and left side)
d)
All on the top side of the boxes
6.

Heterozygous is when...

a)

the alleles are the same.

b)

the alleles are different.

c)

the alleles are absent.

d)

the alleles are present.

7.

T = tall and t = short

In the punnett square shown, what belongs in the missing square

a)

tt

b)

Tt

c)

Bb

d)

TT

8.

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

a)

recessive

b)

dominant

9.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
10.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
11.

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

12.

The genotypes AA and Aa always show up as the __________ phenotype.

a)

dominant

b)

recessive

13.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
14.

Which of the following genotypes is homozygous dominant?

a)

A

b)

Aa

c)

AA

d)

aa

15.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

d)

B

16.

A recessive allele is represented by a ______ letter.

a)

lower-case

b)

capital

17.

A dominant allele is represented by a ______ letter.

a)

lower-case

b)

capital

18.

Blue-eyed is a ______.

a)

genotype

b)

phenotype

19.

Bb is a ______.

a)

genotype

b)

phenotype

20.

If a black guinea pig (BB) and a white guinea pig (bb) mate, there is a ______ chance that a white guinea pig will be born.

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

21.

A version of a gene is called a(n)

a)

allele

b)

characteristic

c)

specific gene

d)

trait

22.

A trait that is expressed if one copy of the allele is present is a(n)

a)

characteristic

b)

dominant trait

c)

gene

d)

recessive trait

23.

An organism’s genetic makeup; the pair of alleles for a trait is called a(n)

a)

dominant trait

b)

genotype

c)

phenotype

d)

recessive trait

24.

An organism’s physical expression of a trait is called a(n)

a)

dominant trait

b)

genotype

c)

phenotype

d)

recessive trait

25.

What is it called when both alleles in a genotype are the same?

a)

Dominance

b)

Heterozygous

c)

Homozygous

d)

Recessiveness

26.

What is it called when the alleles in a genotype are different?

a)

Dominance

b)

Heterozygous

c)

Homozygous

d)

Recessiveness

27.

Which pair of alleles is an example of homozygous recessive?

a)

bb

b)

BB

c)

Bb

28.

Which pair of alleles is an example of homozygous dominant?

a)

tt

b)

TT

c)

Tt

29.

Which pair of alleles is an example of heterozygous alleles?

a)

ll

b)

LL

c)

Ll

30.

What are physical characteristics of an organism?

a)

Alleles

b)

Genotypes

c)

Genes

d)

Traits

31.

In a Punnett square, a lower case letter stands for a ____________ allele.

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

32.

Hair color, height, eye color and freckles are examples of human traits. What do we call the physical expression of the genetic material of an organism?

a)

genetics

b)

heredity

c)

genotype

d)

phenotype

33.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
34.

Which of the following genotypes is homozygous dominant?

a)

A

b)

Aa

c)

AA

d)

aa

35.

Bb is a ______.

a)

genotype

b)

phenotype

36.

The passing of genetic material from parents to offspring (children)

a)

traits

b)

characteristics

c)

heredity

d)

phenotype

37.

He is known as the "Father of Genetics" and used pea plants because they reproduce quickly.

a)

Robert Hooke

b)

Gregor Mendel

c)

Theodor Swann

d)

Matthias Schleiden

38.

The trait represented by a capital letter

a)

Recessive

b)

Dominant

c)

Phenotype

d)

Incomplete dominance

39.

The trait represented by a lower case letter

a)

Recessive

b)

Dominant

c)

Phenotype

d)

Incomplete Dominance

40.

The different versions of a gene or one of a pair of genes

a)

Dominant

b)

Recessive

c)

Allele

d)

Phenotype

41.

A feature that has different forms in a population ( CATEGORIES) Examples: Seed color, Eye color

a)

Trait

b)

Characteristic

c)

Allele

d)

Dominant

42.

The different forms within a characteristic (blue eyes, brown eyes)

a)

Dominant

b)

Recessive

c)

Characteristic

d)

Trait

43.

The actual gene makeup of an organism ( Tt)

a)

Genotype

b)

Phenotype

c)

Trait

d)

Characteristic

44.

The physical appearance or the visible characteristic "What you see"

a)

Genotype

b)

Phenotype

c)

Allele

d)

Dominant

45.

An organism that has alleles that are different for a trait (Tt)

a)

Purebred

b)

Hybrid

c)

Allele

d)

Trait

46.

Organism with two alleles that are the same (TT or tt)

a)

Purebred

b)

Hybrid

c)

Allele

d)

Trait

47.

An organism with two alleles that are the same (TT or tt)

a)

Homozygous

b)

Heterozygous

c)

Trait

d)

Allele

48.

An organism that has alleles that are different for a trait (Tt)

a)

Homozygous

b)

Heterozygous

c)

Allele

d)

Trait

49.

The blending of two different alleles to create a third unique phenotype. Example: Snapdragon: red X white ---> pink

a)

Probability

b)

Punnett Square

c)

Codominance

d)

Incomplete Dominance

50.

The blending of two alleles where they are both expressed

a)

Probability

b)

Punnett Square

c)

Codominance

d)

Incomplete Dominance

51.

Segment of DNA found in chromosomes that give instructions for producing a certain characteristic

a)

Dominant

b)

Recessive

c)

Gene

d)

Phenotype

52.

Chance or possibility that an event will take place

a)

Probability

b)

Genotype

c)

Phenotype

d)

Allele

53.

A special chart used to show possible gene combinations

a)

Line graph

b)

Circle Graph

c)

Punnett Square

d)

Pie Graph