Dominant and Recessive Traits

What does homozygous mean?

• having two different alleles of a particular gene or genes.
• having two of the same alleles of a particular gene or genes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A homozygous 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-LS3-3

Which describes the following? BB

• Homozygous
• Heterozygous
• recessive
• Option 4

Tags

NGSS.HS-LS3-1

Which punnet square has a 75% chance of the dominant trait showing up.

• 
• 
• 
• 

Tags

NGSS.HS-LS3-3

aa will always be ...

• dominant
• recessive
• either
• neither

Tags

NGSS.HS-LS3-1

Aa is

• homozygous
• heterozygous
• recessive
• all of the above

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many boxes would say BB?

• 0
• 1
• 2
• 3

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

NGSS.HS-LS3-3

Biologists have found that a form of deafness is a recessive trait in dogs. If a female dog that is heterozygous for the trait mates with a male dog that is deaf, what percent of their offspring will be deaf?

• 0%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3