The document describes three genetic inheritance patterns: law of complete dominance, co-dominance, and incomplete dominance. For each pattern, it provides examples of test crosses between parents with different genotypes and asks what the possible phenotypes and genotypes are of the offspring. Specifically, it gives examples of straight hair vs widow's peak, blood types AB vs B, and red vs white radishes to illustrate complete dominance, co-dominance, and incomplete dominance, respectively.

1. LAW OF COMPLETE DOMINANCE
Perform a test-cross between a
homozygous straight hairline (S)
father and a homozygous
widow’s peak (s) mother.
Dominant: Straight Hairline
Recessive: Widow’s peak
Parents Genotype: X
What is the possible phenotype of the children?
(in percent)
What is the possible genotype of the children?
PR: GR:
CO-DOMINANCE
Perform a test-cross between a
man with type AB blood (AB)
and a woman with type B blood
(B0).
Parents Genotype: X
What is the possible phenotype of the children?
(B and AB only, in percent)
What is the possible genotype of the children?
(AB, A0, B0, and BB)
PR: GR:
INCOMPLETE DOMINANCE
Perform a test-cross between a
pure-breeding red (R) radish and
a pure breeding white (W)
radish. A combination of the 2
dominant alleles makes it purple
Parents Genotype: X
What is the possible phenotype of the radishes?
(in percent)
What is the possible genotype of the radishes?
PR: GR: