Incomplete Dominance in Genetics

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Questions and Answers

Match column I with column II:

Dihybrid test cross = 1:1:1:1 independent Law of segregation = Purity of gametes in man Law of assortment independent = Dihybrid cross ABO blood group = Multiple allelism

Match column I with column II:

Multiple alleles = Blood group in humans Polygenes = Skin colour in humans Pleiotropy = Phenylketonuria in humans

Match column I with column II:

Autosomal recessive traits = Sickle cell anemia Sex-linked recessive trait = Hemophilia Metabolic error linked to autosomal recessive trait = Phenylketonuria

In snapdragon, if a cross between true-breeding red flowered (RR) plants and true-breeding white flowered (rr) plants showed a progeny of plants with all pink flowers, why is the appearance of pink flowers not known as blending?

<p>Because the phenomenon is known as incomplete dominance.</p> Signup and view all the answers

What is this phenomenon known as?

<p>Incomplete dominance</p> Signup and view all the answers

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Study Notes

Incomplete Dominance

Red flowered snapdragon plants (RR) crossed with white flowered snapdragon plants (rr) produces pink flowered progeny.
This does not represent blending because the parental traits (red and white) reappear in the F2 generation.
Instead, this phenomenon is called incomplete dominance.
In incomplete dominance, neither allele is completely dominant over the other, resulting in a phenotype that is intermediate between the two homozygous phenotypes.
In this case, red (RR), and white (rr) alleles produce a blend that is pink (Rr).