OL Monohybrid 2023

Match the correct genotypes.

• TT

• homozygous dominant

• Tt

• homozygous recessive

• tt

• heterozygous

In guinea pigs, black coat color (B) is dominant to white coat color. Which genotypes and phenotypes are correct?

• BB = black

• Bb = black

• bb = white

• Bb = white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In guinea pigs, black coat color (B) is dominant to white coat color (b). What would the genotypes of a heterozygous male and a white female be?

• Bb x bb

• BB x bb

• Bb x Bb

• bb x BB

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In guinea pigs, Black fur (B) is dominant to white fur (b). What percentage of the offspring will have white fur?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

One parent has brown eyes (BB) and the other parent has blue eyes (bb). What is the probability their children will have blue eyes?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In llamas the allele for curly hair (H) is dominant over the allele for straight coat color (h).

If a llama with straight hair is crossed with a heterozygous curly llama, which of the following genotypic ratios can be expected?

• 0 HH: 2 Hh: 2 hh

• 1 HH: 2 Hh : 1 hh

• 2 HH: 0 Hh : 2 hh

• 2 HH: 1 Hh : 0 hh

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What would be the genotype of the second parent?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In cherry tomatoes, red color (R) is dominant to yellow color (r). If two heterozygous plants are crossed, what percentage of the offspring will be yellow?

Tags

NGSS.HS-LS3-3

A student’s mother is heterozygous for attached earlobes, a recessive trait. The student’s father is also heterozygous for that trait. What are the phenotypic ratios for the offspring? (Select TWO)

• 75% free earlobes

• 25% attached earlobes

• 50% free earlobes

• 50% attached earlobes

• 25% free earlobes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3