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Genetics Quiz Review

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.
What does a Punnett square show?
a)

The location of chromosomes

b)

The possible genetic makeup of offspring

c)

The number of alleles that exist

d)

The physical traits of parents

2.
Which allele is considered dominant?
a)

Lowercase letter

b)

Uppercase letter

c)

A hybrid allele

d)

Allele not shown in the Punnett square

3.
Which allele is considered recessive?
a)

Uppercase letter

b)

A lowercase letter

c)

The allele that appears more often in offspring

d)

The allele that is always shown in the phenotype

4.
What are alleles?
a)

The physical characteristics of an organism

b)

Different variations of a gene

c)

The location of DNA in a cell

d)

The combination of traits in an organism

5.
What does heredity refer to?
a)

The random variation of traits

b)

The process of cells dividing

c)

The passing of traits from parent to offspring

d)

The study of DNA and chromosomes

6.
Where are chromosomes found?
a)

In the mitochondria

b)

In the nucleus of cells

c)

On the cell membrane

d)

In the ribosomes

7.
What is a genotype?
a)

The physical appearance of an organism

b)

The genetic makeup of an organism

c)

The environmental factors influencing traits

d)

The process by which traits are passed on

8.
What is a phenotype?
a)

The genetic code

b)

The physical traits an organism displays

c)

The sequence of alleles in DNA

d)

The process of cell division

9.
What does homozygous mean?
a)

Having two different alleles for a trait

b)

Having two identical alleles for a trait

c)

Having one dominant and one recessive allele

d)

Having no alleles for a trait

10.
What does heterozygous mean?
a)

Having two different alleles for a trait

b)

Having two identical alleles for a trait

c)

Having no alleles for a trait

11.
How are alleles represented on a Punnett square?
a)

By numbers

b)

By shapes

c)

By uppercase and lowercase letters

d)

By colors

12.
What happens with the traits of dominant and recessive alleles?
a)

The dominant allele always hides the recessive allele

b)

The recessive allele is always expressed if present

c)

The dominant allele is only expressed when two copies are present

d)

The recessive allele is never expressed

13.
If a parent has the genotype Aa and the other has aa, what is the probability of the offspring inheriting the dominant trait?
a)

0%

b)

25%

c)

50%

d)

100%

14.
In a cross between a homozygous dominant parent (AA) and a heterozygous parent (Aa), what is the probability of their offspring being homozygous dominant (AA)?
a)

0%

b)

25%

c)

50%

d)

100%

15.
What type of trait is shown when an organism has two different alleles for a gene?
a)

Homozygous

b)

Heterozygous

c)

Genotypic

d)

Phenotypic

16.
If both parents are heterozygous (Aa), what is the possible genotype of their child?
a)

AA, Aa, aa

b)

AA, Aa

c)

Aa, aa

d)

AA, aa

17.
Which of the following is an example of a helpful mutation?
a)

A mutation that allows an organism to survive in a new environment

b)

A mutation that causes a genetic disease

c)

A mutation that has no effect on an organism's survival

d)

A mutation that makes an organism weaker

18.
Which of the following is an example of a harmful mutation?
a)

A mutation that makes an organism more resistant to disease

b)

A mutation that causes a genetic disorder or illness

c)

A mutation that increases an organism's ability to find food

d)

A mutation that helps an organism adapt to its environment

19.
What is a neutral mutation?
a)

A mutation that provides a survival advantage

b)

A mutation that harms the organism

c)

A mutation that does not affect the organism's survival or fitness

d)

A mutation that always leads to a new trait

20.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%