what is complete dominance?

Question

The biology books tell me about incomplete dominance, but I hear my teacher telling me about complete dominance and my book doesn't tell me what it is.

Answer 1

 

Complete dominance you could say is the default result in Mendelian genetics

You have dominant alleles and recessive alleles.  Often the dominant allele will override the recessive allele completely.  For example, in peas smooth may be dominant over wrinkled

Complete dominance would mean that any genotype with at least one dominant allele will produced smooth peas.  The only genotype that will produced wrinkled peas is two recessive alleles.

Here are some charts to help you see the difference.  Assume that capital P is dominant over lower case p.  Lowercase p is the allele for wrinkled peas and capital P is the allele for smooth peas.

In complete dominances, the capital P will always completely override the small p

Genotype	Phenotype
PP	Smooth peas
Pp	Smooth Peas
pp	Wrinkled Peas