| Summary: | Guppy males exhibit many elaborate secondary sexual characters, and in the wild, populations exhibit extreme polymorphic characters. Several of these characters have been shown to be attractive to females: conspicuous coloration, especially bright orange and black spots, large caudal fins and body size, high courtship display rate and so on. Knowing the Y-linkage of many quantitative traits, the work of selection of domesticated strains of guppy is easier. Excepting the body-base colour and other one-locus sex-linked but recombining colour patterns, the characters of interest in guppy culture can be selected on father and sons only.
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