A new study has narrowed down the area of the genome that makes the black shade in the throat and face of warblers by learning the hybrid offspring started when two species mate. The hybrids of golden-winged and blue-winged warblers have a blend of coloration from the mum or dad species, which allows researchers to decide which areas of the genome are associated with which shade designs. The study carried out by the researchers of the Penn State unveils an extra advanced foundation for the quantity of yellow in warbler bellies and raises concerns about how hybrids of those species are classified.
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