Special CasesNina and Kristi
Codominance
non identical alleles that express two different phenotypes both present themselves
Blood type
both A and B blood types are dominant
if you inherit both then your blood type is AB
AA Ao
AB Bo
A o
A
B
Codominance
Chickens
Mother hen is white(Wb) and Father is black (BB)
Both white and black are dominant
WB Bb
WB Bb
W b
B
B
Incomplete Dominance
When one Allele is not completely dominant over another
Epistasis
When one gene modifies or masks another
C =pigment c = no pigment B= black b = brown
Sex Linked Genes
Genes that are directly linked to the chromosomes that determine sex
Females inherit both x chromosomes
Males inherit the x and y chromosomes
The x chromosome codes for around 1500 genes
The y chromosome codes for around 80 genes