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Worksheets

Genetics

Total questions: 38

Worksheet time: 27mins

Name
Class
Date
1.

A version of a gene is called a(n)

a)

Allele

b)

Characteristic

c)

Specific Gene

d)

Trait

2.

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

3.

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

4.

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

a)

Dominant Trait

b)

Genotype

c)

Phenotype

d)

Recessive Trait

5.

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

a)

Dominance

b)

Heterozygous

c)

Homozygous

d)

Recessiveness

6.

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

a)

Dominance

b)

Heterozygous

c)

Homozygous

d)

Recessiveness

7.

Which pair of alleles is an example of homozygous recessive?

a)

bb

b)

BB

c)

Bb

8.

Which pair of alleles is an example of homozygous dominant?

a)

tt

b)

TT

c)

Tt

9.

Which pair of alleles is an example of heterozygous alleles?

a)

ll

b)

LL

c)

Ll

10.

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

a)

Dominant

b)

Recessive

c)

Homozygous

d)

Heterozygous

11.

Hair colour, height, eye colour 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

12.

The passing of genetic traits from parent to offspring.

a)

Heredity

b)

Trait

c)

Gene

d)

Allele

13.
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

14.

An allele whose trait only shows up when a dominant allele is present.

a)

Hidden allele

b)

Dominant allele

c)

Recessive allele

d)

Present allele

15.

 Dominant alleles are represented by -

a)

Capital Letters

b)

Lowercase Letters

c)

Both

d)

Neither

16.

 Recessive alleles are represented by -

a)

Capital Letters

b)

Lowercase Letters

c)

Both

d)

Neither

17.

This type of cell contains one set of DNA

a)

Diploid

b)

Haploid

c)

Devoid

d)

Sinoid

18.

This type of cell contains two sets of DNA

a)

Diploid

b)

Haploid

c)

Sinoid

d)

Devoid

19.

The complete set of an organisms chromosomes is called its ______.

a)

Karyotype

b)

Phenotype

c)

Genotype

d)

Kaleidotype

20.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
21.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
22.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
23.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
24.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
25.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
26.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
27.

What belongs in the last box?

a)

RR

b)

Rr

c)

rr

d)

ff

28.

Look at the punnett square shown. What allele pair would replace the "?"

a)

WW

b)

Ww

c)

ww

29.

Look at the punnett square. What is the probability that the offspring would have homozygous alleles for the trait?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

30.
Both parents in this Punnet square
a)
are homozygous dominant
b)
are homozygous recessive
c)
are heterozygous
d)
have blue eyes
31.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
32.

This type of inheritance pattern is a MIXTURE of two traits. This is known as ---

a)

incomplete dominance.

b)

codominance

33.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

34.

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

35.

If you cross a black chicken with a white chicken and only black AND white feathered chickens are produced, then feather color follows the inheritance pattern of ---

a)

Incomplete dominance

b)

Codominance

36.

The green fish offspring in this image is an example of ---

a)

Incomplete dominance

b)

Codominance

37.

What do the phenotypes of the offspring in this Punnett square represent?

a)

incomplete dominance

b)

codominance

38.

This cow with brown and white spots is an example of ---

a)

Incomplete dominance

b)

Codominance