Incomplete Dominance (Leaving Cert Biology): Flashcards

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Incomplete Dominance
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Incomplete dominance definition

Neither allele completely dominant over the other

Heterozygous phenotype in incomplete dominance

Between the two homozygous phenotypes

Snapdragon cross: red x white flower result

Pink flowers

Where incomplete dominance occurs

Plants and coat colour of animals like cattle

Allele masking in incomplete dominance

Neither allele masks the other

Heterozygous trait in incomplete dominance

Blend of the two homozygous traits

Snapdragon genotype RR phenotype

Red-flowered

Snapdragon genotype rr phenotype

White-flowered

Snapdragon genotype Rr phenotype

Pink-flowered (intermediate)

F1 genotype from RR x rr cross

100% Rr

F1 phenotype from RR x rr snapdragon cross

100% pink flowers

F2 genotype percentages from Rr x Rr

25% RR, 50% Rr, 25% rr

F2 phenotype percentages from Rr x Rr

25% red, 50% pink, 25% white

Pink flower percentage in F2 (Rr x Rr)

50%

Red flower percentage in F2 (Rr x Rr)

25%

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