Wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Genetic Basics

Total questions: 69

Worksheet time: 2hrs 34mins

Name
Class
Date
1.

What is a specific observable characteristic of an organism?

a)

DNA

b)

Gene

c)

Trait

d)

Chromosome

2.

How many alleles for the same gene do offspring get?

a)

1

b)

2

c)

23

d)

100's to 1000's

3.

Homologous Chromosomes are a combination of how many chromosomes from each parent?

a)

1 from each parent

b)

2 from each parent

c)

1/2 from each parent

d)

23 from each parent

4.

What is a variation of a particular gene such as brown and blue eyes?

a)

Karyotype

b)

DNA

c)

Allele

d)

Chromosome

5.

Which of the following can a homologous pair of chromosomes contain?

a)

always 2 different alleles for the same gene

b)

always 2 of the same allele for a gene

c)

either 2 of the same allele or 2 different alleles for the same gene

6.

Which set of chromosomes represents a male?

a)

XX

b)

XY

c)

XXY

d)

XYY

7.

How many alleles for a particular trait does each person get from each parent?

a)

1

b)

2

c)

46

d)

23

8.
 which is heterozygous ?  
a)
Tt
b)
TT
9.
Which is homozygous ?
a)
Zz
b)
SS
10.
the genetic makeup of an organism
a)
heterozygous
b)
punnet square
c)
genotype
11.
What is a phenotype
a)
The genetic make up (code)
b)
The physical trait
12.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
13.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
14.
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
15.
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
16.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
17.
An organism's appearance is known as its
a)
heredity
b)
phenotype
c)
genotype
d)
pedigree
18.
B=brown eyes
b= blue eyes
What is true about 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
19.
What is the phenotype of the heterozygous parent in the punnett square?
a)
green
b)
yellow
c)
hybrid
d)
purebred
20.
In this punnett square, which is the dominant trait?
The B stands for bud.
a)
purple flower bud
b)
white flower bud
c)
dominant
d)
recessive
21.
What is the percentage of offspring that have green pods?
a)
100%
b)
75%
c)
50%
d)
25%
22.
What is the definition of genotype?
a)
The physical expression of a trait
b)
The genetic combination of alleles 
c)
the genes on a DNA strand
23.
What is the definition of phenotype?
a)
The physical expression of a trait
b)
The genetic combination of alleles
c)
A gene on the DNA strand
24.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
25.
This is an example of what?
a)
Complete dominance
b)
Incomplete dominance
c)
Codominance
d)
None of the above
26.
Snapdragon flowers come in red, pink and white.  What type of inheritance is this?
a)
Complete Dominance
b)
Incomplete Dominance
c)
Codominance
d)
Polygenic Inheritance
27.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
28.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
29.

Genes are ...

a)

That is hidden whenever the dominant allele is present

b)

Segment of DNA on chromosome that control a trait or characteristic

c)

A number of how an event occur

d)

An organism that has two different alleles for a trait

30.

Dominant alleles are alleles whose trait ......... shows up when the alleles is present.

a)

always

b)

never

c)

sometimes

d)

usually

31.

Different forms of a gene

a)

Punnett square

b)

Gene

c)

Allele

d)

Homozygous

32.

Alleles that are hidden whenever the dominant allele is present

a)

Dominant alleles

b)

Recessive alleles

c)

Homozygous

d)

Heterozygous

33.

An organism's physical appearance or visible trait.

a)

Genotype

b)

Phenotype

34.

An organism's genetic makeup or alleles.

a)

Genotype

b)

Phenotype

35.

B= brown eyes

b = blue eyes

What is the probability of blue eyes?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

36.

B= brown eyes

b = blue eyes

What is the probability of brown eyes?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

37.

R= red fur

r = white fur

What is the probability of red fur?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

38.

Gerry and his wife both have blue eyes, which is a recessive trait. Which is true about their baby?

a)

He's adopted

b)

The baby will not inherit their traits

c)

The baby will be blue eyed

d)

The baby will have brown hair

39.

Match the following

a)

BB

1.

Homozygous Recessive

b)

Bb

2.

Heterozygous

c)

bb

3.

Homozygous Dominant

40.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
41.
The dominant trait as seen in this punnett square is
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
42.
What is the percentage of offspring that have green pods?
a)
100%
b)
75%
c)
50%
d)
25%
43.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXB
b)
XbXb
c)
XbY
d)
XBY
44.

What type of inheritance do two alleles have if their traits blend together?

a)

Incomplete Dominance

b)

Codominance

c)

Complete dominance

d)

Sex-Linked

45.

Both traits expressed TOGETHER (not blended)

a)

Codominance

b)

Incomplete Dominance

c)

Mendelian trait

d)

Sex-linked

46.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X r Y ?

a)

male with red eyes

b)

female with red eyes

c)

male with white eyes

d)

female with white eyes

47.

A white flowered plant is crossed with a red flowered plant resulting in F1 offspring that are pink. This is an example of:

a)

codominance

b)

incomplete dominance

c)

complete dominance

48.

In fruit flies, eye color is a sex linked trait. Red is dominant to white. What is the sex and eye color of flies with the following genotype: X R X R ?

a)

male with red eyes

b)

female with red eyes

c)

male with white eyes

d)

female with white eyes

49.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

d)

female with white eyes

50.

This is an example of ___________?

a)

Incomplete dominance

b)

Co-Dominance

c)

Sex-linked inheritance

d)

Autosomal recessive inheritance

51.

This is an example of ___________.

a)

Incomplete Dominance

b)

Codominance

c)

Multiple Alleles

d)

Polygenic Inheritance

52.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
53.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXB
b)
XbXb
c)
XbY
d)
XBY
54.

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

a)

25

b)

50

c)

75

d)

100

55.

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 black?

a)

25

b)

50

c)

75

d)

100

56.
What would indicate a normal human male?
a)
XX
b)
X
c)
XY
d)
XXY
57.

This type of inheritance pattern is a Blend of both traits.

a)

incomplete dominance

b)

co-dominance

c)

complete dominance

d)

recessive pattern

58.

If you cross a black chicken with a white chicken, black-white checkered chickens are produced. What kind of inheritance pattern does this follow?

a)

incomplete Dominance

b)

Co-Dominance

c)

Sex-linked Inheritance

d)

Multiple alleles

59.

In ___ dominance , the heterozygous phenotype lies somewhere between the two homozygous phenotypes.

a)

incomplete

b)

codominance

c)

recessive dominance

d)

none of the answers are correct

60.

Cases in which the phenotypes produced by both alleles are clearly expressed are called ____.

a)

incomplete dominance.

b)

codominance.

c)

recessive dominance.

d)

none of the answers are correct.

61.

What are the phenotype percentages of the offspring?

(A-Brown fur color; a-white fur color)

a)

50 % Brown fur and 50% White fur

b)

25 % Brown fur and 75% White fur

c)

75 % Brown fur and 25% White fur

d)

0% Brown fur and 100% White fur

62.
What chance does the offspring have of showing a dominant trait?
a)
100%
b)
75%
c)
50%
d)
0%
63.
What is the allele combination for square 1?
a)
Dd
b)
DD
c)
dd
d)
D
64.
What is the chance of this offspring having a recessive trait?
a)
25%
b)
100%
c)
50%
d)
0%
65.

What type of dominance is shown in the picture?

a)

Complete dominance

b)

Incomplete dominance

c)

Codominance

66.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
67.
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
68.

A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring.

a)

50% heterozygous and 25% homozygous recessive

b)

50% heterozygous and 50% homozygous recessive

c)

100% homozygous recessive

d)

25% heterozygous and 50% homozygous

69.

Which of the following must be the father's genotype?

a)

RR

b)

Rr

c)

rr

Similar Resources on Wayground

Endocrine system

66 questions

Endocrine system

quiz

Worksheet

•

10th - 12th Grade

Digestive System

73 questions

Digestive System

quiz

Worksheet

•

10th - 12th Grade

Life Science Final Review

70 questions

Life Science Final Review

quiz

Worksheet

•

KG - University

Final Staar Biology Practice

67 questions

Final Staar Biology Practice

quiz

Worksheet

•

9th Grade

Diffusion and Osmosis

72 questions

Diffusion and Osmosis

quiz

Worksheet

•

10th Grade

Diversity of Life Pre-Unit Test Quiz

72 questions

Diversity of Life Pre-Unit Test Quiz

quiz

Worksheet

•

11th - 12th Grade

Unit 1 Test Review

71 questions

Unit 1 Test Review

quiz

Worksheet

•

9th - 11th Grade

IGCSE 0654 B10 Reproduction all

72 questions

IGCSE 0654 B10 Reproduction all

quiz

Worksheet

•

8th - 10th Grade