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Genetics of polled and horned goats
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The information about how an animal (or a plant) is built is stored in the chromosomes in the nucleus of the cells. The information for an individual feature is called a gene. Normally, there are two sets of similar chromosomes in every cell. Hence, every gene for a certain feature exists twice in every animal.
The gene which is responsible for the horns of a goat works like a switch with two positions: One position is for "horns" (p-), the other position is for "polled" (P+). If the two genes for "horns" or "polled" are identical on both chromosomes (P+P+ or p-p-), the goat is HOMOZYGOUS, If they are different (P+p-), the goat is HETEROZYGOUS.
The gene for "polled" (P+) is dominant over the gene for "horns" (p-). Consequently, all goats which carry at least one P+ gene are polled, and only those goats where both genes are p- have horns.
Because the gene for "polled" is closely linked to a recessive gene that creates hermaphrodites (inter-sexes) in females, does where both genes are P+P+ are infertile. This is the reason why it is not possible to breed for polled goat.

(Click here for full article).
"Jamaica" (1435, right), "Jazz" (1437), and "Jacky" (1436) are sisters. Their mother ("Humptie", H085) is polled, their father ("Emmett", RK6-60) has horns. "Jamaica" and "Jazz" are polled.
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