Dihybrid Crosses Punnett Squares

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

If you have a parent who has GgBb as their genotype, what are the possible alleles they could donate to their gametes?

• GB, Gb, gB, gb
• GB, GB, gb, gb
• Gb, Gb, Gb, GB
• GG, BB, gg, bb

Tags

NGSS.HS-LS3-1

How many offspring will you have in a dihybrid cross? 

• 4
• 8
• 16
• 5

T4 - Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

T4 - What genotype is missing from this Punnett Square?

• RrYy
• RRYY
• rryy
• RrYY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T4 - Based off this Punnett Square, what fraction of the offspring will have wrinkled, yellow seeds?

• 9/16
• 3/16
• 1/16
• 16/16

T4 - What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits (ex. AaBb) ?

• 1/16
• 1/4
• 1/2
• 3/16

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Assume mom's gametes are on the left, what is her genotype?

• TTZz
• TtZz
• ttZZ
• TtZZ

Assume dad's gametes are on top, what is his genotype?

• AAPP
• AaPp
• aaPP
• Aapp

In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?

• GG
• Gg
• gg
• green

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2