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To put it simply, the term "heterozygous" is more of a genotypical characteristic than a phenotypical (or physical) trait. For instance, a black Angus cow can be genotypically heterozygous for the red-hair-coloured gene, but phenotypically she looks homozygous for the black hair coat. However, for F1 cattle like the Angus-Hereford cross, heterozygosity is pretty easy to see as these calves have the white face from their horned Hereford sire and the black body and no horns from their Angus dams, for instance. However without knowing basic genetics, someone could assume that these cattle are homozygous for the black body and white face and polled characteristics, when in fact they are genotypically heterozygous for all traits. So to describe a heterozygous cow is quite difficult and virtually impossible, especially if you are only trying to see about one gene and if you do not have information on either what the dam or sire of that cow looks like.

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