What is Dominance?
Country: United States
Date: November 2008
Why is yellow color dominant to green color in pea seeds?
If the gene for yellow seeds codes for an enzyme that converts the
green pigment to a yellow pigment and the allele for green pigment
cannot produce this enzyme, then in any cell that contains both the
yellow and green alleles, the yellow pigment will be synthesized, but
if only green alleles are in a cell, no yellow pigment will be
synthesized, so it appears that the green allele is recessive, i.e.
the yellow allele is dominant.
Ron Baker, Ph.D.
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Update: June 2012