Monohybrid Crosses

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

How much of the offspring pictured have a heterozygous result?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The physical expression of a genetic trait is called a

• mutation

• genotype

• crossing over

• phenotype

Tags

NGSS.HS-LS3-1

Which of the following alleles is homozygous recessive?

• Tt
• tt
• TT
• T

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Genetic crosses involving a particular type of flower exhibit complete dominance with respect to petal color. Red (R) is dominant to white (r). Using the Punnett square, what is the expected percentage of offspring that will have white flowers from a cross of parent flowers with a genotype of Rr.

• 0%
• 25%
• 50%
• 100%

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%

• tt = 100%

• TT= 75% tt = 25%

• Tt = 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Look at the Punnett Square, what belongs in the missing square?

• tt

• Tt

• Dominant

• TT

Both parents in this Punnet square

• are homozygous dominant

• are homozygous recessive

• are heterozygous

• have blue eyes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2