1. Incomplete Dominance and Codominance Patterns

2. Incomplete Dominance Pattern
a gene inheritance pattern in which neither allele is dominant so the alleles blend together
neither allele is completely dominant nor completely recessive
two alleles result in three phenotypes

3. Incomplete Dominance Pattern
heterozygous individuals have a phenotype somewhere in the middle of the two alleles
Example in humans
a straight-haired parent and a curly-haired parent will produce a wavy-haired child
use superscript lowercase letters to show different alleles
Hs = straight, Hc = curly
HsHs = straight, HsHc = wavy, HcHc = curly

4. Incomplete dominance

5. Codominance Pattern
Is this how it works???

6. Codominance Pattern
a gene inheritance pattern in which a trait in a heterozygous individual has two phenotypes expressed simultaneously
both alleles are dominant
two alleles result in three phenotypes
heterozygous individuals have both alleles visible in their phenotype
Example in humans
AB blood type

7. Codominance in Camellia Flowers
CWCW
CRCR
CRCW

8. Codominance in Shorthorn Cattle
CWCW
CRCR
CWCR

9. Codominance Pattern
use superscript capital letters to show different alleles
CW = white, CR = red
CWCW = white, CRCR = red, CWCR = roan

10. Codominance Pattern
Is this how it works???

11. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Identification of Alleles Hs = straight hair Hc = curly hair Parent Genotype Identification Woman: HsHc Man: HcHc

12. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Punnett Square Hs Hc Hc Hc

13. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Punnett Square Hs Hc
HsHc Hc Hc

14. Punnett Square HsHc HcHc
Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Punnett Square Hs Hc
HsHc
HcHc Hc Hc

15. Punnett Square HsHc HcHc
Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Punnett Square Hs Hc
HsHc
HcHc Hc Hc

16. Punnett Square HsHc HcHc
Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Punnett Square Hs Hc
HsHc
HcHc Hc Hc

17. Offspring Phenotypic Ratio 1 wavy haired child : 1 curly haired chiled
Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in humans. A heterozygous individual will produce wavy hair. If a wavy-haired woman marries a curly-haired man, what will the expected phenotypic ratio of their children be?
Offspring Phenotypic Ratio 1 wavy haired child : 1 curly haired chiled

18. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Identification of Alleles Fr = red flowers Fw = white flowers Parent Genotype Identification White plant: FwFw Pink plant: FrFw

19. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Punnett Square Fw Fw Fr Fw

20. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Punnett Square Fw Fw
FrFw Fr Fw

21. Punnett Square FrFw FwFw
Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Punnett Square Fw Fw
FrFw
FwFw Fr Fw

22. Punnett Square FrFw FwFw
Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Punnett Square Fw Fw
FrFw
FwFw Fr Fw

23. FrFw Punnett Square FwFw
Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Punnett Square Fw Fw
FrFw
FwFw Fr Fw

24. Offspring Phenotypic Ratio 1 pink plant : 1 white plant
Red flowers show incomplete dominance to white flowers in Morning Glory plants. If both alleles are present, the flowers appear pink. If a white plant crosses with a pink plant, what will the expected phenotypic ratio of the offspring be?
Offspring Phenotypic Ratio 1 pink plant : 1 white plant

25. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Identification of Alleles CR = red flowers CW = white flowers Parent Genotype Identification Spotted plant #1: CRCW Spotted plant #2: CRCW

26. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Punnett Square CR CW CR CW

27. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Punnett Square CR CW
CRCR CR CW

28. Punnett Square CRCR CRCW
Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Punnett Square CR CW
CRCR
CRCW CR CW

29. Punnett Square CRCR CRCW
Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Punnett Square CR CW
CRCR
CRCW CR CW

30. Punnett Square CRCR CRCW CWCW
Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Punnett Square CR CW
CRCR
CRCW
CWCW CR CW

31. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous individuals (CRCW) have pedals with red and white spotted coloration. If two spotted flowers are bred together, what will the expected phenotypic ratio of the offspring be?
Offspring Phenotypic Ratio 1 red plant : 2 spotted plants : 1 white plant

32. In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Identification of Alleles CR = red coat color CW = white coat color Parent Genotype Identification Roan cattle: CRCW White cow: CWCW

33. In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Punnett Square CR CW CW CW

34. In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Punnett Square CR CW
CRCW CW CW

35. Punnett Square CRCW CWCW
In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Punnett Square CR CW
CRCW
CWCW CW CW

36. Punnett Square CRCW CWCW
In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Punnett Square CR CW
CRCW
CWCW CW CW

37. Punnett Square CRCW CWCW
In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Punnett Square CR CW
CRCW
CWCW CW CW

38. Offspring Phenotypic Ratio 1 roan cattle : 1 white cattle
In shorthorn cattle, the alleles for red coat color (CR) and for white coat color (CW) are codominant to each other. The heterozygous condition (CRCW) produces an animal with both red and white hairs. The cattle industry calls this mixture roan. If one roan cattle is bred with one white cow, what will the phenotypic ratio of their offspring be?
Offspring Phenotypic Ratio 1 roan cattle : 1 white cattle

39. Summary
How are heterozygous individuals in incomplete patterns different than heterozygous individuals in codominance patterns?