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    Hybridization involving incomplete dominance

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    In cattle, hornless is dominant to horned, red coat color is incompletely dominant to white, where the heterzygote has a color called roan. What would the parental genotypes be in the following crosses? What woyld the genotypic and phenotypic ratios of the F1 be in the crosses?

    a. heterozygous hornless red bull X horned roan cow
    b. horned roan bull X horned whote cow
    c. horned white bull X homozygous hornless red cow

    I am having such a hard time figuring out what to pull out to cross, how to set it up?

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    Solution Summary

    In codominance, both alleles express equally, hence, typical mendelian phenotypic ratio gets modified.