Difficult Punnett Square Practice Word Problems

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?

• 100% tall
• 50% tall, 50% short
• 75% tall, 25% short
• 25% tall, 75% short

Tags

NGSS.HS-LS3-1

Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?

• 100% Gg
• 50% GG, 50% Gg
• 25% GG, 50% Gg, 25% gg
• 75% Gg, 25% gg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

• 100% Pp (purple)
• 50% Pp (purple); 50% pp (white)
• 75% Pp (purple); 25% pp (white)
• 25% PP, 50% Pp, 25% pp
  75% purple, 25% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In humans, brown eyes are dominant over blue eyes.  What would be the allele key you would make from this information?

• B-brown
  b-blue
• B-blue
  b-brown
• BB-brown
  Bb-blue
• bb-brown
  Bb-blue

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If brown eyes are dominant over blue eyes, what would be the  parent genotypes if two heterozygous brown eyed persons were crossed?

• BB and bb
• BB and Bb
• Bb and Bb
• bb and Bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If brown eyes are dominant to blue eyes, what would be the genotype of the offspring if a homozygous brown eyed individual is crossed with a homozygous blue eyed?

• BB
• bb
• Bb
• BB and bb

Tags

NGSS.HS-LS3-1