Incomplete Dominance and Codominance Patterns Incomplete Dominance Pattern

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Incomplete Dominance and Codominance Patterns

Incomplete Dominance and Codominance Patterns

Incomplete Dominance Pattern • a gene inheritance pattern in which neither allele is dominant

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

Incomplete Dominance Pattern • heterozygous individuals have a phenotype somewhere in the middle of

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 • Hs. Hs = straight, Hs. Hc = wavy, Hc. Hc = curly

Incomplete dominance

Incomplete dominance

Codominance Pattern Is this how it works? ? ?

Codominance Pattern Is this how it works? ? ?

Codominance Pattern • a gene inheritance pattern in which a trait in a heterozygous

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

Codominance in Camellia Flowers CW CW C RC R C RC W

Codominance in Camellia Flowers CW CW C RC R C RC W

Codominance in Shorthorn Cattle CW CW C RC R CW CR

Codominance in Shorthorn Cattle CW CW C RC R CW CR

Codominance Pattern • use superscript capital letters to show different alleles – CW =

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

Codominance Pattern Is this how it works? ? ?

Codominance Pattern Is this how it works? ? ?

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Identification of Alleles Hs = straight hair Hc = curly hair Parent Genotype Identification Woman: Hs. Hc Man: Hc. Hc

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Punnett Square Hs Hc Hc Hc

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Punnett Square Hs Hc Hc H s. H c Hc

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Punnett Square Hs Hc Hc H s. H c Hc H c

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Punnett Square Hs Hc H s. H c Hc H c

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Punnett Square Hs Hc Hc H s. H c H c

1. Having straight-hair (Hs) or curly hair (Hc) is an incomplete dominant trait in

1. 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 curlyhaired man, what will the expected phenotypic ratio of their children be? Offspring Phenotypic Ratio 1 wavy haired child : 1 curly haired chiled

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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: Fw. Fw Pink plant: Fr. Fw

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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 Fr Fw Fw

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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 Fr Fw F r. F w Fw

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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 Fr Fw F r. F w Fw F w

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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 Fr F r. F w Fw F w

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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 F r. F w Fw F w

2. Red flowers show incomplete dominance to white flowers in Morning Glory plants. If

2. 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

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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 CR CW CW

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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 CR CW C RC R CW

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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 CR CW C RC W

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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 CR C RC R CW C RC W

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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 C RC W CW CW

3. Flower pedal color in Camellia flowers shows a codominance pattern of inheritance. Heterozygous

3. 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

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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 C RC W CW

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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 CW CW CR CW C RC W CW CW

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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 C RC W

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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 C RC W CW CW

4. In shorthorn cattle, the alleles for red coat color (CR) and for white

4. 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

Summary • How are heterozygous individuals in incomplete patterns different than heterozygous individuals in

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