Biology 2581B Chapter Notes - Chapter 5.2: Abo Blood Group System, Zygosity, Antigen

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That can affect the results of genetic crosses factors other than principles of random segregation/independent assortment. With dominance, heterozygote possesses the same phenotype as one of the homozygotes. When the heterozygote has a phenotype intermediate between the phenotypes of two homozygotes, the trait is said to display incomplete dominance. Dominance understood with regards to how the phenotype of the heterozygote relates to. Complete and incomplete dominance that of the two homozygotes. Complete dominance heterozygote displays the phenotype of the dominant allele incomplete dominance heterozygote displays an intermediate phenotype between the two homozygotes. When a trait displays incomplete dominance, the genotypic ratios and phenotypic ratios are the same because each genotype has its own phenotype. Codominance heterozygote expresses the phenotypes of both homozygotes. Many phenotypes can be observed at different levels anatomical, physiological and molecular the type of dominance exhibited by a characteristic depends on the level at which the phenotype is examined.

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