Understanding Punnett Squares in Genetics

What is a Punnett square used for in genetics?

• To determine the age of an organism

• To predict the probability of offspring inheriting particular traits

• To measure the size of a cell

• To calculate the speed of genetic mutations

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NGSS.HS-LS4-3

In a monohybrid cross, what does each box in a Punnett square represent?

• A different species

• A possible genotype of the offspring

• The phenotype of the parents

• The number of chromosomes

Which of the following is an example of a genotype?

• Blue eyes

• Bb

• Tall height

• Curly hair

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NGSS.HS-LS3-2

What is the phenotype of an organism with the genotype Bb, if B represents brown eyes and b represents blue eyes?

• Blue eyes

• Green eyes

• Brown eyes

• Hazel eyes

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NGSS.HS-LS3-1

How many alleles does each parent contribute to their offspring for a single trait?

• One

• Two

• Three

• Four

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NGSS.HS-LS3-1

Which of the following best describes the difference between genotype and phenotype?

• Genotype is the physical appearance, while phenotype is the genetic makeup

• Genotype is the genetic makeup, while phenotype is the physical appearance

• Genotype and phenotype are the same

• Genotype is the environment, while phenotype is the behavior

Which of the following represents a homozygous recessive genotype?

• AA

• Aa

• aa

• aA

Which of the following is an example of a phenotype?

• Bb

• Tt

• Green eyes

• AA

T - tall and t = short. In the Punnett square below, what belongs in the missing square (a)  

• tt
• Tt
• Bb
• TT

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Complete the punnett square

a

b

c

d

T T

t t

T t bottom row

T t top row

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NGSS.HS-LS3-1

NGSS.HS-LS3-2