Monohybrid Cross Practice

Homer decides to breed Santa's little helper (BB) with Penelope (Bb). B- Dark Brown b- White What percentage of the puppies will be white?

• 0%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

Which of the choices is homozygous recessive?

• BB

• Bb

• bb

Which of the choices is homozygous dominant?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-2

Dimples is dominant to no dimples. Determine the genotype and phenotype for a heterozygous female and a homozygous dominant male.

• 1/4 dd 3/4 DD

  1/4 no dimples 3/4 dimples

• 1/4 DD 2/4 Dd 1/4 dd

  3/4 dimples 1/4 no dimples

• 2/4 DD 2/4 Dd

  4/4 dimples

• 4/4 Dd

  4/4 dimples

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Brown eyes are dominant to blue eyes. Determine the genotype and phenotypes for a homozygous dominant female and a homozygous recessive male.

• 1/4 BB 2/4 Bb 1/4 bb

  3/4 Brown eyes 1/4 blue eyes

• 2/4 BB 2/4 Bb

  4/4 Brown eyes

• 4/4 Bb

  4/4 Brown eyes

• 3/4 BB 1/4 Bb

  4/4 Brown eye

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Free ear lobes are dominant to attached ear lobes. Determine the genotype and phenotype for a heterozygous female and a homozygous recessive male.

• 2/4 FF 2/4 Ff

  4/4 free ear lobes

• 2/4 Ff 2/4 ff

  2/4 free ear lobes 2/4 attached ear lobes

• 3/4 FF 1/4 ff

  3/4 free ear lobes 1/4 attached ear lobes

• 1/4 FF 2/4 Ff 1/4 ff

  3/4 free ear lobes 1/4 attached ear lobes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?

• BB X BB

• BB X Bb

• Bb X Bb

• bb X bb

Tags

NGSS.HS-LS3-2

In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a): Two sheep with no belly fur mate and produce offspring. What is the percent chance that the offspring will have belly fur?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Smooth seeds are dominant over wrinkled seeds.
What is the genotype ratio for the following cross?
Nn X NN

• NN = 100%, Nn = 0%, nn = 0%

• NN = 50%, Nn = 25%, nn = 25%

• NN = 50%, Nn = 50%, nn = 0%

• NN = 25%, Nn = 50%, nn = 25%

Tags

NGSS.HS-LS3-1

G = green, g = yellow
The genotype for a yellow plant is...

• GG

• Gg

• gg

• all of the choices result in yellow

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2