Alternate Patterns of Inheritance

Incomplete dominance – the dominant allele cannot totally hide the recessive, resulting in a blended heterozygote

Co-Dominance – 2 dominant alleles expressed at the same time

ABO blood type in humans – the alleles for A and for B are both dominant over O

Environmental factors – soil pH affects the color of hydrangea flowers

Acidic soil makes the flowers blue, basic or alkaline soil makes the flowers pink

Environmental factors– temperature and season affect the coat color of arctic foxes

Never on the Y Chromosome!!!!!!! Sex-Linked (X-linked) – traits that are found on the X Chromosome (NOT Y) XY – male XX – female B – no hairloss b – baldness XbY – male with the gene for baldness XBXb – heterozygous female Never on the Y Chromosome!!!!!!!