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

NEVER PUT ANY LETTER ON THE MALES Y