SCIENCE 9 L3

What is codominance?

• One allele is dominant over the other

• Traits blend together to form a new one

• Both alleles are fully and equally expressed
  

• A trait skips generations

Which of the following is an example of codominance?

• Red and white flower produce pink flower

• Tall and short plant produce medium plant

• Black and white chicken produce a speckled chicken

• A brown dog and a white dog produce a tan dog

In codominance, what is seen in the offspring?

• Only the dominant trait

• A blend of both traits

• Both traits appear side by side

• The traits disappear

If R = red coat and W = white coat, what would an RW cow look like?

• Red

• White

• Roan (red and white patches)

• Pink

What blood type is an example of codominance?

• Type A

• Type B

• Type O

• Type AB

Which genotype shows codominance?

• RR

• RW

• WW

• Rr

What happens when two roan cows (RW × RW) are crossed?

• All roan

• Only red and white

• Some red, some white, some roan

• All red

What is the genotype of a cow with white fur if red (R) and white (W) are codominant?

• RR

• RW

• WW

• Ww

Which of the following is not a codominant example?

• Blood type AB

• Roan cattle

• Pink snapdragons

• Speckled chickens

What is the main difference between codominance and incomplete dominance?

• Codominance is recessive; incomplete dominance is dominant

• In codominance, traits blend; in incomplete, both traits show

• In codominance, both traits are visible; in incomplete, traits blend

• They are the same