Y
chemical symbol, yttrium.
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Y chromosome
the chromosome which causes the medulla of the embryonic gonad to form a testis. If there is one other chromosome present and it is X the newborn animal will be a fertile male. If there are two other X chromosomes, giving an XXY configuration, it will be a phenotypic male but sterile. Autosomal genes can have the same effect, creating an intersex newborn in an animal with XX chromosomes.
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Y piece
a leakproof connecting piece between the endotracheal tube and the anesthetic machine, the inspiratory and expiratory hoses of the machine each occupying an arm of the Y piece.
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Y sutures
anatomical structures connecting the concentric lamellae of the lens. The anterior one is erect, the posterior one is inverted.
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yabapoxvirus
a poxvirus of African nonhuman primates.
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yabby, yabbie
Australian term for Cherax destructor (freshwater crayfish).
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Yabila grass
see panicum queenslandicum.
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YAC
yeast artificial chromosome.
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yak
a large, up to 6 ft high at the shoulder, very longhaired ruminant with a round forehead, widely separated horns, a shoulder hump and a grunting call instead of a lowing one. Hunted for its meat and hair, it is also an excellent draft animal and can survive well at altitudes above 13,000 ft (4000 m). Called also Bos mutus.
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yam
see dioscorea.
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