INCOMPLETE DOMINANCE Part 2. SOME TERMINOLOGY P 1 – Original parents F 1 – First generation F 2 – Second generation P 1 X P 1 = F 1 F 1 X F 1 = F 2.

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INCOMPLETE DOMINANCE Part 2

SOME TERMINOLOGY P 1 – Original parents F 1 – First generation F 2 – Second generation P 1 X P 1 = F 1 F 1 X F 1 = F 2

CODOMINANCE Codominance - Situation in which both alleles of a gene contribute to the phenotype of the organism. Example – A solid white cow is crossed with a solid brown cow and the resulting offspring are spotted brown and white (called roan).

FILL IN THE PUNNETT SQUARE BB X WW BW BB W W BW…..A Roan Cow….a White cow with Brown Spots

MULTIPLE ALLELES Multiple Alleles- Three or more alleles of the same gene. Even though three or more alleles exist for a particular trait, an individual can only have two alleles - one from the mother and one from the father.

FAMILY TRAITS Pedigree traces the occurrence of a trait through generations of a family Pedigrees can be useful in tracing sex-linked disorders, or disorders associated with an allele on a sex chromosome.