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el origen evolutivo de los cromosomas b no está claro, pero se piensa que presumiblemente han derivado de segmentos heterocromáticos de cromosomas normales en un pasado remoto.
==origin==the evolutionary origin of supernumerary chromosomes is obscure, but presumably they must have been derived from heterochromatic segments of normal chromosomes in the remote past.
"lhr" se localiza en una región heterocromática del genoma y su secuencia ha divergido entre estas dos especies de un modo consistente con mecanismos de selección positiva.
"lhr" is located in a heterochromatic region of the genome and its sequence has diverged between these two species in a manner consistent with the mechanisms of positive selection.