Punnett Squares

Which is Heterozygous?

• Tt

• BB

• ff

• Dominant

Which is homozygeous?

• Tt

• BB

• Ff

• Blue

What are the chances that the offspring will have homozygous recessive traits?

• 1 in 4

• 3 out of 4

• 75%

• 50%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What are the chances of heterozygous genotypes in offspring?

• 50%

• 25%

• 1 in 4

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the dominant trait here?

• Bb

• Recessive eyes

• Blue eyes

• Brown eyes

Tags

NGSS.HS-LS3-1

Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Black hair color is dominant to white hair color in mice.  Determine the phenotypic ratio for the offpring of a heterozygous black mouse and a white mouse.

• 4 Black: 0 White
• 3 Black: 1 White
• 2 Black: 2 White
• 0 Black: 4 White

Tags

NGSS.HS-LS3-1

Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What does a filled in square represent?

• Not affected Female
• Not affected Male
• Affected Male
• Affected Female

How many generations are shown in this pedigree?

• 1
• 2
• 3
• 4