Siberian Goldfinch – isabelle
Description:
The Isabelle factor is sex-linked and recessive.
It was obtained through selective breeding by crossing over between the sex-linked, recessive agate factor and the sex-linked, recessive brown factor. In fact, a wild-type male carrying the brown and agate alleles once sired an isabelle female.
As a reminder, crossing-over is the exchange of segments between two paired chromosomes, causing a crossover. In this case, two traits linked to the same chromosome may become unlinked. Conversely, two traits previously linked to different chromosomes may become linked.
The result is magnificent!
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