Punnett Squares

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

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

• 0 in 4
• 1 in 4
• 2 in 4
• 4 in 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 

• 50 % Brown Hair and 50% Blond Hair 
• 25 % Brown Hair and 75% Blond Hair 
• 75 % Brown Hair and 25% Blond Hair 
• 0% Brown Hair and 100% Blond Hair 

Tags

NGSS.MS-LS3-2

NGSS.MS-LS4-4

A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 

• 100 % tan
• 100 % brown 
• 50 % brown and 50% tan 
• 75 % brown and 25 % tan 

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.MS-LS3-2

What belongs in Box 2?

• y

• Y

• YY

• yy

What belongs in Box 4?

• Y

• YY

• Yy

• yy

Tags

NGSS.MS-LS4-4

What belongs in Box 8?

• Y

• YY

• Yy

• yy

Tags

NGSS.MS-LS3-2

What belongs in box 1?

• F

• f

• FF

• Ff

Tags

NGSS.MS-LS3-2