wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Heredity, Genes, Traits, & Punnett Squares

Total questions: 21

Worksheet time: 2hrs 45mins

Name
Class
Date
1.

Both genotypes (AA) and (aa) are considered...

a)

Homozygous

b)

Heterozygous

2.

Which ratio of the offspring from the cross will be homozygous recessive for the  trait of tallness? 

a)

0 : 4

b)

1 : 4

c)

2 : 4

d)

4 : 4

3.

Which of the following genotypes is homozygous dominant?

a)

Ae

b)
Aa
c)
AA
d)
aa
4.

Which of the following genotypes is homozygous recessive?

a)

Ww

b)

W

c)

WW

d)

ww

5.

Which of the following genotypes is heterozygous?

a)
Bb
b)
BB
c)
bb
d)
B
6.

In a heterozygous genotype, the ___________ allele will show in the phenotype.

a)
recessive
b)
dominant
c)
lower case letter
d)
both 
7.

In order for the dominant trait to present in the phenotype- a genotype MUST HAVE at least....

a)

2 uppercase alleles

b)

1 uppercase allele

c)

2 lowercase alleles

d)

1 lowercase allele

8.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
9.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
10.

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

11.

Who is considered the "father of genetics"?

a)

Reginald Punnett

b)

Gregor Mendel

c)

James Watson

d)

Charles Darwin

12.

How many alleles are paired in a typical genotype?

a)

1

b)

2

c)

3

d)

4

13.

What is the genotypic ratio of the offspring?

a)

3:1

b)

1:3

c)

1:2:1

d)

2:2

14.

In a flowering plant species, red flower color (R) is dominant over white flower color (r).

to produce offspring with white flowers- what is one possible cross you could do? (you may need some paper to work these out)

a)

Rr x Rr

b)

RR x RR

c)

RR x Rr

15.

In a population of rabbits, straight ears (E) are dominant over floppy ears (e).

Which parent crossing would produce 75 % straight-eared offspring and 25% floppy ears (you may need some paper to work these out)

a)

EE x EE

b)

Ee x Ee

c)

EE x ee

d)

ee x ee

16.

A gene is described as...

a)

A change in DNA structure

b)

An observable trait

c)

A segment of DNA

d)

A type of protein

17.
Differences in traits are called _________ and explain why siblings don't look exactly alike.
a)
mutations
b)
variations
c)
traits
d)
evolution
18.

an observable characteristic

a)

trait/phenotype

b)

gene

c)

allele

d)

DNA

19.

What determines your traits?

a)

DNA

b)

chromosomes

c)

Cells

d)

Proteins

20.

Different versions, or variations of genes that form genotypes are called?

a)

Traits

b)

Chromosomes

c)

Alleles

d)

Mutations

21.

The pairs of alleles that an organism's genes have

a)

genotype

b)

phenotype

c)

chromosome

d)

recessive