The document discusses codominance and incomplete dominance in cow color and snapdragon flower color. Codominance results in three phenotypes from two alleles, such as red, white, and roan coats in cows. Incomplete dominance results in a blended phenotype, such as pink flowers, from the combination of red and white alleles in snapdragons. Mating cows or flowers with different combinations of alleles results in predictable genotypes and phenotypes in the offspring.

1. CODOMINANCE &
INCOMPLETE DOMINANCE

2. CODOMINANCE & INCOMPLETE DOMINANCE
Cow colour comes from alleles that are codominant…
“red” “white” “roan”
+
CR C W CRCW

3. CODOMINANCE & INCOMPLETE DOMINANCE
What are the genotypes and phenotypes of the
following cows?
CWCW CRCR CRCW

4. CODOMINANCE & INCOMPLETE DOMINANCE
What would happen if you mate the following cows?
CRCR x CRCW

5. CODOMINANCE & INCOMPLETE DOMINANCE
What would happen if you mate the following cows?
C R
C W F1 Genotypes:
1 CRCR : 1 CRCW
CRCR CRCW
CR z F1 Phenotypes:
1 red : 1 roan
CRCR CRCW
CR

6. CODOMINANCE & INCOMPLETE DOMINANCE
What would happen if you mate the following cows?
C W
C W F1 Genotypes:
All CRCW
CRCW CRCW
CR z F1 Phenotypes:
All 1 roan
CRCW CRCW
CR

7. CODOMINANCE & INCOMPLETE DOMINANCE
Snapdragon flower colour comes from alleles that are
incompletely dominant…
“red” “white” “pink”
+
F F’ FF’

8. CODOMINANCE & INCOMPLETE DOMINANCE
What are the genotypes and phenotypes of the
following snapdragon flowers?
FF F’F’ FF’

9. CODOMINANCE & INCOMPLETE DOMINANCE
What would happen if you cross the following flowers?
Mon
cherie!
My, what soft
petals you
have!
FF F’F’

10. CODOMINANCE & INCOMPLETE DOMINANCE
What would happen if you cross the following flowers?
F’ F’ F1 Genotypes:
All FF’
FF’ FF’
F z F1 Phenotypes:
All pink
FF’ FF’
F