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Punnett Square Genetics - Printable Science Worksheets grade 8 - Wayground

Punnett Square Genetics

Christopher Wojciechowski

By Christopher Wojciechowski

15 questions

8th - 8th Grade

Science

699 plays

Updated Oct 2025

This Grade 8 science worksheet develops foundational genetics skills through 15 selected-response questions: 2 multiple-select items and 13 multiple-choice items. Students distinguish genotypes from phenotypes, identify homozygous dominant, homozygous recessive, and heterozygous allele combinations, and apply complete-dominance rules to predict traits from AA and Aa genotypes. The worksheet also asks students to identify codominance and incomplete dominance in examples such as calico cats, checkered chickens, and roan cattle. In the final questions, students interpret Punnett-square crosses, determine possible genotypes, and calculate percentages for outcomes such as TT, Tt, and tt. It is a free printable worksheet with a complete answer key, suitable for guided practice, independent review, or a quick formative assessment after instruction on genotype notation and inheritance patterns.

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Punnett Square Genetics

Total questions: 15

Name
Class
Date
1.

Which of the following are GENOTYPES? (select all correct answers)

a)

black hair

b)

homozygous dominant

c)

heterozygous

d)

blue eyes

e)

BB

2.

PHENOTYPE is

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

nucleic acid

d)

Aa

3.

Which of the following are PHENOTYPES?

a)

green skin

b)

Aa

c)

homozygous recessive

d)

purple eyes

e)

black fur

4.

Which of the following represents alleles for the homozygous dominant genotype?

a)

Aa

b)

aa

c)

AA

5.

Which of the following represents alleles for the homozygous recessive genotype?

a)

Aa

b)

aa

c)

AA

6.

Which of the following represents alleles for the heterozygous genotype?

a)

Aa

b)

aa

c)

AA

7.

If A = red fur and a = white fur, what color fur would Aa be? (COMPLETE DOMINANCE)

a)

red

b)

white

c)

purple

d)

blue

8.

If A = red fur and a = white fur, what color fur would AA be? (COMPLETE DOMINANCE)

a)

red

b)

white

c)

purple

d)

blue

9.

What is a GENOTYPE?

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

mitosis

d)

meiosis

10.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
11.
A tall plant (TT) is crossed with a short plant (SS) and a medium plant (TS) results. This is what type of inheritance pattern?
a)
Incomplete Dominance
b)
Codominance
12.
If you cross a black chicken with a white chicken, only checkered chickens would be produced. What kind of inheritance…
If you cross a black chicken with a white chicken, only checkered chickens would be produced.  What kind of inheritance pattern does this follow?
a)
incomplete Dominance
b)
Co-Dominance
13.

In cattle red coats are represented as RR, and white coats are represented as WW.


What is the genotype for Roan color?

a)

RR

b)

RW

c)

WW

14.
What are the possible genotypes for this cross? And what percentage of each is produced? (if this isn't familiar, re-watch…

What are the possible genotypes for this cross? And what percentage of each is produced? (if this isn't familiar, re-watch this week's videos!)

a)

TT = 25% Tt= 50% tt=25%

b)

all tall

c)

TT= 75% tt = 25%

d)

Tt = 100%

15.

A heterozygous tall pea plant (Tt) is crossed with a short pea plant (tt).


Perform a punnett square cross and determine the Genotype & %. (if this isn't familiar, re-watch this week's videos!)

a)

100% Tt

b)

50% Tt, 50% tt

c)

75%Tt, 25%tt

d)

25%TT, 50%Tt, 25%tt

WaygroundAnswer Key

Punnett Square Genetics

Total questions: 15

1.
b)

homozygous dominant

, c)

heterozygous

, e)

BB

2.
b)

the physical trait of an organism

3.
e)

black fur

, d)

purple eyes

, a)

green skin

4.
c)

AA

5.
b)

aa

6.
a)

Aa

7.
a)

red

8.
a)

red

9.
a)

the genetic make-up of an organism

10.
b) Co dominance
11.
a) Incomplete Dominance
12.
b) Co-Dominance
13.
b)

RW

14.
a)

TT = 25% Tt= 50% tt=25%

15.
b)

50% Tt, 50% tt

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FAQs

What does this Punnett Square Genetics worksheet cover?

This Grade 8 worksheet uses 2 multiple-select and 13 multiple-choice questions to build accuracy with genotype and phenotype vocabulary, allele notation, complete dominance, codominance, and incomplete dominance. Students also interpret Punnett-square crosses to identify possible genotypes and calculate inheritance percentages, including outcomes such as 50% Tt and 50% tt.

How can I use this worksheet to teach genotype and phenotype relationships?

Introduce the worksheet by having students sort examples such as BB, Aa, black hair, and blue eyes into genotype or phenotype categories. Then model how AA, Aa, and aa relate to complete dominance before students use the inheritance-pattern questions to compare codominance, such as calico fur, with incomplete dominance, such as a medium-height plant. Finish by working through one Punnett-square percentage question together before assigning the final cross independently.

What mistakes should I watch for when students complete this genetics worksheet?

Watch for students labeling visible traits such as green skin or black fur as genotypes, or treating allele combinations such as Aa as phenotypes. Students may also confuse AA with aa, overlook that Aa is heterozygous, or select incomplete dominance when both traits appear separately in a codominance example. In the Punnett-square items, check that students distinguish genotype percentages from a broad statement such as all tall and include every possible combination.

How do I assign and grade this Punnett Square Genetics worksheet?

Wayground provides this worksheet as a printable PDF and as a digital quiz, with a complete answer key for the genotype, phenotype, inheritance-pattern, and Punnett-square questions. You can grade printable student work by scanning it with the Wayground for Teachers app, or use the digital quiz for online responses and results.

How can I differentiate this genetics worksheet for my students?

In the worksheet’s Advanced Settings, adjust font spacing or font size to make the allele-combination and inheritance-pattern choices easier to scan. You can also apply a dyslexia-friendly font or translate the worksheet into another language while keeping the multiple-select and multiple-choice format.

Where can I find more worksheets like this on Wayground?

Wayground offers a broad collection of free printable worksheets and practice problems across subjects, with downloadable PDFs and answer keys to support mastery of essential skills and concepts. Browse more worksheets at https://wayground.com/en-us/worksheets.

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