Chapter 12

If B = brown hair and b = blonde hair, what is the probability of brown hair?

• 25%
• 50%
• 0%
• 75%

G = green, g = yellow
The genotype for a yellow plant is...

• GG
• Gg
• gg
• all of the choices result in yellow

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 

What is the probability of heterozygous offspring?

• 25%
• 50%
• 0%
• 100%

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

In mice coat color is incompletely dominant. Black (B) and white (W) are homozygous. Gray mice are heterozygous.

What is the genotype for a Gray mouse?

• BB

• Bb

• BW

• Brown

• WW

This is an example of ---

• Incomplete dominance

• Codominance

What does this Punnett square and the probabilities of the ofspring represent?

• incomplete dominance

• codominance

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be white?

• 25

• 50

• 0

• 100

Chicken feathers are inherited through codominance. When a black chicken BB is mated with a white chicken WW, the resulting phenotype is called erminette/checkered BW.   

What are the phenotypes if a checkered /erminette chicken is mated with a black feathered chicken.

• Black: 50%

  White: 0%

  Checkered: 50%

• Black: 0%

  White: 50%

  Checkered: 50%

• Black: 50%

  White: 0%

  Grey: 50%

• Black: 50%

  White: 50%

  Checkered 50%