title: Identification of the sex chromosomes in the bald eagle.
abstract: Karyotypes of five American bald eagles (Haliaeetus leucocephalus and H. alacanus) are compared. All had 2n=66 chromosomes which fell into 3 size groups: A, 20 pairs of biarmed chromosomes; B, 9 pairs of acrocentric chromosomes and C, 4 pairs of microchromosomes. C-banding was done in two eagles and a heterochromatic W chromosome was identified in a presumptive female. The ZZ and ZW chromosomes could be identified in the karyotypes.
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002843:Chromatin / Q000032:analysis; D002875:Chromosomes; D005260:Female; D007621:Karyotyping; D008214:Lymphocytes / Q000648:ultrastructure; D008297:Male; D012730:Sex Chromosomes; D012732:Sex Determination Analysis; D013194:Staining and Labeling
chemical_list: D002843:Chromatin