Non- mendelian genetics
Quick Facts
- Traits can be controlled by more than one gene
- some alleles will never be dominate nor recessive
- the heterozygous phenotype is a blending of the two homozygous phenotype
Incomplete Dominates
- is when one allele is not completely dominate over the other
Example
Red= R
White= r
Rr= pink( blending of the two alleles)
difference between heterozygous and homozygous
heterozygous= RR x rr (leads to F2)
homozygous= Rr x Rr
codominates
are two alleles both being expressed as a dominant phenotype.
- When both alleles are present (the heterozygous condition) the phenotype is a blend of the two alleles
Blood types
Blood type O is a recessive blood type will not show the O in AO, or BO witch are heterozygous
sex- linked
males have an x and a y chromosome
females have an x and x chromosome
These chromosomes determine sex
the x chromosomes are much larger than the y