Incomplete dominance

Incomplete dominance - Incompletedominance

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Incomplete dominance Incomplete dominance  occurs when both alleles in a heterozygous individual are expressed,  producing a phenotype different from either single allele. For example, red snapdragons crossed with  white snapdragons produce pink snapdragons. A cross of two pinks restores the red and white in a 1  red:2 pink:1 white ratio. The dominant allele does not completely mask the recessive in this case.  Although the phenotype is changed, the alleles themselves are unaltered, as can be shown by a  backcross in which they segregate and express their original trait in the homozygous condition.  Mutations mutation  is defined as any change in the DNA of an organism—a sufficiently broad definition to  include all manner of changes:  deletions  (a piece of the chromosome breaks off and is lost),  translocations  (pieces of material are exchanged between two nonhomologous chromosomes), 
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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Incomplete dominance - Incompletedominance

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