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Genetics Unit Test Review

Total questions: 45

Worksheet time: 28mins

Name
Class
Date
1.

The process where the # of chromosomes are reduced by ½ to form sex cells.

a)

Mitosis

b)

Meiosis

c)

Osmosis

d)

Fertilization

2.

Instructions for an inherited trait are called ...

a)

traits

b)

Alleles

c)

Genes

d)

DNA

3.

Different forms of a gene that decides a characteristic.

a)

Genes

b)

Phenotypes

c)

Alleles

d)

DNA

4.

When gene pairs are written, how is a dominant allele represented?

a)

trait

b)

aa

c)

lowercase letter

d)

capital letter

5.

Used to organize the possible offspring combinations from a genetic cross.

a)

probability

b)

punnett square

c)

heredity

d)

graph paper

6.

An organisms Physical appearance...

a)

genotype

b)

phenotype

c)

trait

d)

gene

7.

These carry the genes that determine sex

a)

alleles

b)

self-pollinating

c)

sex chromosomes

d)

body cells

8.

An organism with either two dominant or two recessive alleles for a given trait

a)

phenotype

b)

genotype

c)

heterozygous

d)

homozygous

9.

The study of heredity

a)

genetics

b)

heredity

c)

probability

d)

trait

10.

A plant that fertilizes itself

a)

self pollinating

b)

cross pollinating

c)

double pollinating

d)

single pollinating

11.

The mathematical chance that something will happen

a)

probability

b)

percentage

c)

genetics

d)

heredity

12.

The passing of traits from parents to offspring

a)

genes

b)

traits

c)

heredity

d)

genetics

13.

The genetic makeup (allele combination) of an organism

a)

phenotype

b)

genotype

c)

homozygous

d)

heterozygous

14.

Makes up the chromosomes in the nucleus of a Eukaryotic cell

a)

DNA

b)

traits

c)

chromosomes

d)

carbohydrates

15.

The trait that is masked if the dominant allele is present

a)

dominant

b)

recessive

c)

stronger

d)

homozygous

16.

An organism with one dominant and one recessive gene for a given trait

a)

homozygous

b)

heterozygous

c)

phenotype

d)

genotype

17.

An inherited characteristic is also known as a

a)

trait

b)

gene

c)

chromosomes

d)

DNA

18.

An individual that does not exhibit a trait but can pass it on to their children

a)

carrier

b)

dominant

c)

recessive

d)

genotype

19.

A plant that fertilizes another plant of the same species

a)

cross pollinating

b)

self pollinating

c)

double pollinating

d)

single pollinating

20.

A change in the DNA

a)

change

b)

mutation

c)

difference

d)

probability

21.

Who studied pea plants to see how traits are passed from parents to offspring and is known as “The Father of Genetics”?

a)

Gregor Mendel

b)

Justin Bieber

c)

Robert C. Punnett

d)

Robert Hooke

22.

Which sex chromosomes do females have?

a)

XX

b)

XY

c)

YY

23.

Which sex chromosomes do males have?

a)

XX

b)

XY

c)

YY

24.

Using the letters (T) for tongue rolling, or (t) for non-roller. Tongue rolling is dominant over non- rolling.

What is the genotype of a heterozygous individual?

a)

Tt

b)

tt

c)

TT

25.

Using the letters (T) for tongue rolling, or (t) for non-roller. Tongue rolling is dominant over non- rolling.

What are the 2 possibilities for genotypes of homozygous individuals?

a)

TT, tt

b)

Tt, TT

c)

Tt, Tt

d)

Tt, tt

26.

Using the letters (T) for tongue rolling, or (t) for non-roller. Tongue rolling is dominant over non- rolling

What would the phenotype be for the heterozygous (different) individual?

a)

Tt

b)

Roller

c)

Non-Roller

d)

tt

27.

Using the letters (T) for tongue rolling, or (t) for non-roller. Tongue rolling is dominant over non- rolling.

What would the phenotype be for tt?

a)

roller

b)

non roller

c)

Both

d)

Tt

28.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
29.
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
30.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
31.
If you have a male with large wings (DD) and a female with small wings (dd). What allele stands for large wings? 
a)
D
b)
d
c)
Dd
d)
dd
32.
A green pea plant (GG) is being crossed with a green pea plant (Gg). What is the phenotype?
a)
100 % rainbow 
b)
50% yellow and 50% green 
c)
100% green
d)
100% yellow 
33.
A red flower (Rr) is crossed with a white flower (rr). What is the genotype?
a)
0 RR; 0 Rr: 4 rr
b)
2 RR; 0 Rr: 2 rr
c)
4 RR; 0 Rr: 0 rr
d)
0 RR; 2 Rr: 2 rr
34.
Two heterozygous red flower (white flowers are recessive) are crossed. What is the phenotype?
a)
75% red and 25% white
b)
25% red and 75% white
c)
100 White 
d)
50% red 50% red 
35.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 
a)
100 % tan
b)
100 % brown 
c)
50 % brown and 50% tan 
d)
75 % brown and 25 % tan 
36.

Does dominant always show up in alleles

a)

Yes

b)

No

37.

What is a punnett squares?

a)

When sperm and eggs join in producing

b)

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

c)

Physical characteristics from the parents offspring

38.
Looking at the punnett square and B is brown eyes and b is blue eyes.  What chance is there that the offspring will have brown eyes?
a)
25%
b)
50%
c)
75%
d)
100%
39.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
40.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
41.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
42.
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
43.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
44.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
d)
Heterozygous for blue eyes
45.
What is the phenotype for the recessive trait?
a)
brown eyes
b)
green eyes
c)
blue eyes

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