Incomplete and Codominance

Incomplete

and

Codominance

Incomplete Dominance

-The heterozygous phenotype is a mixture of the two homozygous phenotypes
-heterozygous becomes a 3rd distinct phenotype

-Neither allele is completely dominant nor completely recessive

Multiple Choice

Incomplete dominance means there are how many different phenotypes possible from the combination of two alleles.

• One

• Two

• Three

Codominance

-Both alleles of the gene and traits are fully and separately expressed

-Both traits in heterozygous are expressed

-Most common example: Blood Typing

Multiple Choice

This is an example of ___________?

• Incomplete dominance
• Co-Dominance

Multiple Choice

This is an example of ___________.

•  Incomplete Dominance
•  Codominance

Multiple Choice

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance
• Co dominance

Multiple Choice

If you cross a black chicken with a white chicken, only checkered chickens would be produced.  What kind of inheritance pattern does this follow?

• incomplete Dominance
• Co-Dominance

Multiple Choice

In chickens, feather color is codominant.  If a black chicken BB is mated with one that is black and white (BW) what are the chances of having a chicken that is black and white?

• 50%
• 0%
• 25%
• 100%

Multiple Choice

In some carnations, flower color exhibits codominance.  Identify the correct genotypes for red, white, and speckled carnations.

• Red = RR, white = rr, speckled = Rr
• Red = RR, white = WW, speckled = rw
• Red = RR, white = ww, Speckled = Rw
• Red = RR, white = WW, speckled = RW

Multiple Choice

This type of inheritance pattern shows BOTH traits in possible offspring

• complete dominance
• incomplete dominance
• co-dominance
• dominant pattern

Multiple Choice

Snap dragon color is a incomplete dominant trait.  A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?

• Red
• Red and White
• White
• Pink

​Incomplete Dominance

Multiple Choice

Radish color is incompletely dominant, red and white are pure breeding colors. While heterozygous are purple.

Cros a red radish with a white.

• 4 purple

• 1 red, 2 purple, 1 white

• 2 red, 2 white

• 1 red, 1 purple, 2 white