Co-cominance and incomplete dominance tutoring quick review

​Two Dominant alleles BLEND together and create an EVEN MIX of the two parents.

Incomplete Dominance

​BOTH of the alleles show up, often leaving stripes or spots.

Co-Dominance

Match

Match the following

Co-Dominanance Chicken

Incomplete Dominance Chicken

Incomplete Dominance Punnet Square

Codominance Punnet Square

• Co-Dominanance Chicken

• Incomplete Dominance Chicken

• Incomplete Dominance Punnet Square

• Codominance Punnet Square

Labelling

This shows the Punnet Square for a certain pairing of horses. Determine the missing Parent's alleles.

Drag labels to their correct position on the image

R

WW

RR

W

Fill in the Blank

The displayed Punnet Square shows the cross between a White Horse (WW) and a Roan horse (RW). What is the percent chance that their offspring will be a Roan horse?

Fill in the Blank

When Black (BB) and White(WW) chickens are crossed, they make a Checkered Chicken (BW). This punnet square shows the cross between two Checkered Chickens. What is the percent chance that their offspring will be a Black Chicken?

Multiple Choice

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

• Codominance

• Incomplete dominance

Multiple Choice

The blending of two traits is known as ---

• incomplete dominance

• codominance

Multiple Choice

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a speckled flower. What is the phenotypic ratio?

• 50% red, 50% speckled

• 25% red, 25% blue

• 100% blue

Square = Male
Circle = Female
Filled = has trait
Empty = no trait

​

Pedigrees

Parts of a
Pedigree

Unaffected

Female

Unaffected

Male

Mating

Offspring

Affected
female
offspring

Unaffected

male offspring

Multiple Choice

What does a filled in square represent?

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

Multiple Choice

Individuals that are shaded in have premature hair whitening. Is this trait dominant or recessive? How do you know?

• Dominant because it skips generations

• Dominant because it is present in every generation

• Recessive because it skips generations

• Recessive because it is present in every generation.