Name: ___________________________________ Date: ______________________ Period: _______

Predicting Genotypes

Predict the genotypes

of each set of parents

based on the

phenotypes of the

parents and offspring.

Assume that all

possible phenotypes

for the offspring are

shown.

Predict the most likely

genotype of each numbered

creature based on its

phenotypes and the

phenotypes of its offspring

and parents.

1: ________ 5: ________

2: ________ 6: ________

3: ________ 7: ________

4: ________

Each child to the right belongs to a different set of parents below (1-3). Determine

which child belongs to each set of parents.

Predict the genotypes

of each set of parents

based on the

phenotypes of the

parents and offspring.

Assume that all

possible phenotypes

for the offspring are

shown.

Predict the most likely

genotype of each numbered

creature based on its

phenotypes and the

phenotypes of its offspring

and parents.

1: ________ 5: ________

2: ________ 6: ________

3: ________ 7: ________

4: ________

Each child to the right belongs to a different set of parents below (1-3). Determine

which child belongs to each set of parents.

Name: ___________________________________ Date: ______________________ Period: _______

Genotypes and Phenotypes Use your vocabulary reference sheet to define the following prefixes and suffixes.

What does homo- mean? _________________ What does hetero- mean? _________________

What does –zygous mean? ______________________________________________________________

Define homozygous: ____________________________________________________________________

Define heterozygous: ___________________________________________________________________

Plant Traits Mammal Traits Insect Traits

Decide which Punnett square represents both the parents and their offspring. Assume that the offspring shown represent the ratio expected from the Punnett square.

GG Gg

Gg

gg

G g

G

g

A B C D

F G H J Dd Dd

Dd

Dd

D D

d

d

Dd

dd

Dd

dd

D d

d

d

DD Dd

DD

Dd

D d

D

D

DD

Dd

Dd

dd

D d

D

d

A B C D TT TT

Tt

Tt

T T

T

t

TT Tt

Tt

tt

T t

T

t

Tt Tt

Tt

Tt

T T

t

t

Tt

tt

Tt

tt

T t

t

t

GG GG

Gg

Gg

G G

G

g

Gg

Gg

Gg

Gg

G G

g

g

GG Gg

GG

Gg

G g

G

G

TT × tt

dd × Dd

Ll × ll

Name: ___________________________________ Date: ______________________ Period: _______

Complete the Punnett squares based on the information in the pictures, and then answer the questions to the right of each Punnett square.

Gg × gg

1. What percentage of the offspring will

have a homozygous recessive genotype?

__________

2. What will be the ratio of gray fur to

white fur in the offspring? __________

Punnett Squares

3. What percentage of the offspring will

have a tall phenotype? __________

4. What percentage of the offspring will

have a homozygous recessive genotype?

__________

5. What percentage of the offspring will

have white eyes? __________

6. What percentage of the offspring will

have a heterozygous genotype?

__________

7. What percentage of the offspring will

have a homozygous dominant genotype?

__________

8. What will be the ratio of long beaks to

short beaks in the offspring? __________

Gray fur White fur

White eyes Dark eyes

Long beak Short beak

Short Tall

pp × PP

Dd × Dd

TT × Tt

Ll × Ll

9. What percentage of the offspring will

have purple flowers as their phenotype?

__________

10. What percentage of the offspring will

have a heterozygous genotype?

__________

11. What percentage of the offspring will

have a heterozygous genotype?

__________

12. What will the ratio of flies with dark

eyes to white eyes be? __________

13. What percentage of the offspring will

be short? __________

14. What percentage of the offspring will

have a homozygous dominant genotype?

__________

15. What percentage of the offspring will

have long beaks? __________

16. What will be the ratio of long beaks to

short beaks in the offspring? __________

17. What percentage of the offspring will

have the phenotype of gray hair?

__________

18. What percentage of the offspring will

have a homozygous recessive genotype?

__________

gg × Gg

White flowers

Purple flowers

Dark eyes Dark eyes

Tall Tall

Long beak Long beak

Gray fur White fur

Tt × Tt

LL × Ll

Dd × Dd

Name: ___________________________________ Date: ______________________ Period: _______

Independent Practice: Punnett Squares Complete the table below using the information provided to the left, and then complete each of the Punnett squares and their accompanying questions.

1. What percentage of the offspring will

have a tall phenotype? __________

2. What percentage of the offspring will

have a homozygous recessive genotype?

__________

3. What percentage of the offspring will

have long beaks? __________

4. What percentage of the offspring will

have a heterozygous genotype?

__________

5. What percentage of the offspring will

have a homozygous dominant genotype?

__________

6. What percentage of the offspring will

have white eyes (dd)? __________

Tall

Dark eyes Dark eyes

Long beak Long beak

Tall

Pp × pp

Dd × dd

Tt × Tt

GG × gg

Ll × ll

7. What percentage of the offspring will

have purple flowers as their phenotype?

__________

8. What percentage of the offspring will

have a heterozygous genotype?

__________

9. What percentage of the offspring will

have a heterozygous genotype?

__________

10. What percentage of the offspring will

have white eyes? __________

11. What percentage of the offspring will

be short? __________

12. What percentage of the offspring will

have a tall phenotype? __________

15. What percentage of the offspring will

have long beaks? __________

16. What percentage of the offspring will

have a heterozygous genotype?

__________

13. What percentage of the offspring will

have the phenotype of gray hair?

__________

14. What percentage of the offspring will

have a homozygous recessive genotype?

__________

Gray fur White fur

Long beak Short beak

Tall Tall

Dark eyes White eyes

Purple flowers

White flowers

Name: ___________________________________ Date: ______________________ Period: _______

INDEPENDENT PRACTICE: Punnett Squares Define homozygous _____________________________________________________________

Define heterozygous ____________________________________________________________

Circle the following genotype(s) that are homozygous: BB Bb bb

Circle the following genotype(s) that are heterozygous: BB Bb bb

Use the information above to answer the following questions and to complete the table below.

1. What is the genotype of an animal that is homozygous dominant for tail length? _____ What would this animal’s phenotype be?

____________________________________

2. What is the genotype of an animal that is homozygous recessive for ear shape? _____ What would this animal’s phenotype be?

_____________________________________

3. What is the genotype of an animal that is homozygous for large ears? _____

What would this animal’s phenotype be? ________________________________

4. What is the genotype of an animal that is homozygous for long tails? _____

What would this animal’s phenotype be? ________________________________

5. What is the genotype of an animal that is heterozygous for eye color? _____

What would this animal’s phenotype be? ________________________________

Complete the table below for the rest of these genotype/phenotype combinations.

1. Gg x Gg What is the ratio of green feathers to yellow feathers? _______________________

2. GG x Gg What percentage of offspring will be homozygous recessive?

_______________________

3. A male which has a short beak is crossed with a female that is heterozygous for beak length. What percentage of offspring will have short beaks?

_______________________

5. SS x Ss What will be the ratio of smooth peas to wrinkled peas? _______________________

Use this information for questions 5-9 on this page.

6. pp x Pp What percentage of offspring will have white flowers?

_______________________

9. A plant which is homozygous for purple flowers is crossed with a plant that has white flowers. What percentage of offspring will have purple flowers?

_______________________

8. Two plants which are heterozygous for pea shape are crossed with each other. What percentage of plants will have wrinkled peas?

_______________________

Complete the following Punnett squares and answer the questions go with each pair. Use the table of information below to answer questions 1-4.

4. Ll x Ll What percentage of offspring will have long beaks?

_______________________

7. A plant which is short is crossed with a plant that is homozygous dominant for height. What will be the ratio of tall plants to short plants?

_______________________

1. A plant which is homozygous for smooth peas is crossed with a plant that is heterozygous for pea shape. What percentage of offspring will have smooth peas?

_______________________

2. A plant which is homozygous short is crossed with a plant that is homozygous tall. What percentage of plants will have a heterozygous genotype? _______________________

3. Two plants which are heterozygous for height are crossed. What will be the ratio of tall plants to short plants in the offspring?

_______________________

4. Ss x Ss What percentage of offspring will have wrinkled peas? _______________________

5. Tt x tt What percentage of offspring will be short?

_______________________

6. PP x Pp What percentage of offspring will have white flowers? _______________________

7. A plant which is homozygous for wrinkled peas is crossed with a plant that is homozygous for smooth peas. What percentage of offspring will have wrinkled peas?

_______________________

8. A plant which is heterozygous for flower color is crossed with a plant that is homozygous for white flowers. What will be the ratio of purple flowers to white flowers?

_______________________

9. A plant which is heterozygous for height is crossed with a plant that has a short phenotype. What percentage of plants will be tall?

_______________________

Name: __________________________ Date: ________________ Period: ______

INDEPENDENT PRACTICE: PUNNETT SQUARES Complete the Punnett squares for each question, then use the table to the right to answer the questions:

10. Ff x ff What percentage of offspring will have spotted fur? _______________________

11. bb x Bb What will be the ratio of brown eyes to blue eyes?

_______________________

12. An animal which is homozygous for short tails is crossed with an animal that is heterozygous for tail length. What percentage of offspring will have long tails? _______________________

13. An animal which is homozygous for brown eyes is crossed with an animal that is homozygous for blue eyes. What percentage of animals will have blue eyes?

_______________________

14. Two animals which are heterozygous for fur pattern are mated. What will be the ratio of solid gray fur to spotted fur in the offspring?

_______________________

15. Ff x Ff What percentage of offspring will have spotted fur? _______________________

16. Bb x bb What percentage of offspring will have blue eyes?

_______________________

17.Tt x Tt What will be the ratio of long tails to short tails in the offspring?

_______________________

18. An animal which is homozygous for spotted fur is crossed with an animal that is homozygous for solid gray fur. What percentage of offspring will have spotted fur?

_______________________

19. An animal which is heterozygous for eye color is crossed with an animal that is homozygous for blue eyes. What will be the ratio of brown eyes to blue eyes in the offspring?

_______________________

20. An animal which is heterozygous for tail length is crossed with an animal that has a short tail. What percentage of offspring will have short tails? _______________________

Use this information for the questions on this page.