ism . ▁ ▁Prior ▁to ▁the ▁mapping ▁of ▁the ▁cre am ▁gene , ▁this ▁loc us ▁was ▁titled ▁C ▁for ▁" color ". ▁There ▁are ▁two ▁alle les ▁in ▁the ▁series : ▁the ▁re cess ive , ▁wild type ▁alle le ▁C ▁and ▁the ▁incomplete ▁dominant ▁CC r . ▁The ▁CC r ▁alle le ▁represents ▁the ▁N 1 5 3 D ▁M AT P ▁mut ation . ▁ ▁C / C ▁re cess ive ▁hom o zy g otes ▁are ▁not ▁affected ▁by ▁cre am ▁and ▁have ▁no ▁true ▁cre am ▁tra its . ▁▁ ▁C / CC r ▁heter o zy g otes ▁have ▁one ▁cre am ▁alle le , ▁and ▁one ▁wild type ▁non - cre am ▁alle le . ▁Only ▁red ▁p ig ment ▁in ▁the ▁hair ▁is ▁dil uted , ▁as ▁seen ▁in ▁bu ck sk ins ▁and ▁pal omin os . ▁ ▁CC r / CC r ▁hom o zy g otes ▁( hom o zy g ous ▁cre ams ) ▁have ▁no ▁wild type ▁non - cre am ▁alle les . ▁The ▁red ▁and ▁black ▁p ig ment ▁in ▁the ▁hair ▁are ▁dil uted ▁to ▁cre am , ▁the ▁eyes ▁are ▁light ▁blue ▁and ▁the ▁skin ▁is ▁ros y ▁p ink . ▁ ▁C ream ▁was ▁first ▁formally ▁studied ▁by ▁Ad al stein sson ▁in ▁ 1 9 7 4 , ▁who ▁reported ▁that ▁the ▁inheritance ▁of ▁pal om ino ▁and ▁bu ck sk in ▁coat ▁colors ▁in ▁I cel and ic ▁horses ▁followed ▁a ▁" sem