incomplete dominance
DESCRIPTION
Incomplete Dominance. Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait. Example: - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/1.jpg)
Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
Incomplete Dominance
![Page 2: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/2.jpg)
Example:
In flowers, petal color demonstrates incomplete dominance. Red results when a flower has homozygous dominant alleles for the trait. White results when a flower has homozygous recessive alleles for the trait. A flower that is heterozygous for this trait will be pink. Predict the genotypic and phenotypic ratios of the offspring for the following:
Rr Rr
Rr Rr
Genotypic Ratio:
100% Rr
Phenotypic Ratio:
100% pink flowers
1. Red and white RR x rr
R R
r
r
![Page 3: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/3.jpg)
Example:
In flowers, petal color demonstrates incomplete dominance. Red results when a flower has homozygous dominant alleles for the trait. White results when a flower has homozygous recessive alleles for the trait. A flower that is heterozygous for this trait will be pink. Predict the genotypic and phenotypic ratios of the offspring for the following:
RR RR
Rr Rr
Genotypic Ratio:
50% RR 50% Rr
Phenotypic Ratio:
50% Red flowers, 50% Pink flowers
2. Red and pink RR x Rr
R R
R
r
![Page 4: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/4.jpg)
Rr Rr
rr rr
Genotypic Ratio:
50% Rr 50% rr
Phenotypic Ratio:
50% Pink flowers 50% White flowers
Genotypic Ratio:
25% RR 50% Rr 25% rr
Phenotypic Ratio:
25% Red flowers 50% Pink flowers 25% White flowers
RR Rr
Rr rr
White and Pink rr x Rr
r r
R
r
Pink and Pink Rr x Rr
R r
R
r
![Page 5: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/5.jpg)
Codominance
Codominance: condition in which both alleles of a gene are expressed in heterozygous offspring.
![Page 6: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/6.jpg)
Example 1:
In cows black coat color and white coat color are codominant. Heterozygous offspring will be spotted.
1. Black cow and White cow BB x WW
BW BW
BW BW
B B
W
W
Genotypic Ratio:
100% BW
Phenotypic Ratio:
100% Spotted cow
![Page 7: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/7.jpg)
Example 1:
In cows black coat color and white coat color are codominant. Heterozygous offspring will be spotted.
2. Black cow and Spotted cow BB x BW
BB BB
BW BW
B B
B
W
Genotypic Ratio:
50% BB 50% BW
Phenotypic Ratio:
50% Black cow 50% Spotted cow
![Page 8: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/8.jpg)
Example 1:
In cows black coat color and white coat color are codominant. Heterozygous offspring will be spotted.
3. Both Spotted cows BW x BW
BB BW
BW WW
B W
B
W
Genotypic Ratio:
25 % BB 50% BW 25% WW
Phenotypic Ratio:
25% Black cow 50% Spotted cow 25% White cow
![Page 9: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/9.jpg)
Example 2:In blood typing, the gene for type A and the gene for type B are codominant. The gene for type O is recessive.
Blood Type (phenotype) Genotype
A AA or AO
B BB or BO
AB AB
O OO
![Page 10: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/10.jpg)
Determine the possible blood types of the offspring when:
1. Mother is type O, Father is type A (homozygous)
AO AO
AO AO
O O
A
A
Genotypic Ratio:
100% AO
Phenotypic Ratio:
100% Type A Blood
![Page 11: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/11.jpg)
Determine the possible blood types of the offspring when:
AA AB
AO BO
A B
A
O
Genotypic Ratio:
25 % AA 25% AO 25% AB 25% BO
Phenotypic Ratio:
50% Type A Blood 25% Type AB Blood 25% Type B Blood
2. Mother is type AB, Father is Type A (heterozygous)
![Page 12: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/12.jpg)
Determine the possible blood types of the offspring when:
AB BO
AO OO
A O
B
O
Genotypic Ratio:
25 % OO 25% AO 25% AB 25% BO
Phenotypic Ratio:
25% Type O Blood 25% Type A Blood 25% Type AB Blood 25% Type B Blood
3. Mother is type A (heterozygous), Father is type B (heterozygous)
![Page 13: Incomplete Dominance](https://reader033.vdocuments.mx/reader033/viewer/2022051623/56815a81550346895dc7ec04/html5/thumbnails/13.jpg)
Determine the possible blood types of the offspring when:
AB AB
AB AB
B B
A
A
Genotypic Ratio:
100% AB
Phenotypic Ratio:
100% Type AB Blood
4. Mother is type B (homozygous), Father is type A (homozygous)