Genetic Crosses with Ratios

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 

• 50 % Brown Hair and 50% Blond Hair 
• 25 % Brown Hair and 75% Blond Hair 
• 75 % Brown Hair and 25% Blond Hair 
• 0% Brown Hair and 100% Blond Hair 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two heterozygous red flower (white flowers are recessive) are crossed. What is the phenotype?

• 75% red and 25% white
• 25% red and 75% white
• 100 White 
• 50% red 50% red 

A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 

• 100 % tan
• 100 % brown 
• 50 % brown and 50% tan 
• 75 % brown and 25 % tan 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?

• none
• 3/4
• 1/2
• all

Tags

NGSS.HS-LS3-1

If a child inherits a dominant allele for dimples (D) and the recessive allele for no dimples (d), the phenotype will be ____.

• DD

• Dd

• dd

• dimples

• no dimples

Tags

NGSS.HS-LS3-1

In the punnett square shown, what is the genotypes of the two parents?

• RW and RR
• RW and WW
• RR and WW
• RW and RR

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Chickens have different types of feathers. Frizzled feathers curl towards a chicken's head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A homozygous dominant round seeded plant is crossed with a homozygous recessive wrinkled seeded plant. What are the genotypes of the parents?

• RR X rr
• Rr X rr
• rr X rr
• RR X Rr

Tags

NGSS.HS-LS3-1