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Y-5: A cusp pattern
found in lower molars in which there are five main cusps separated
by grooves, and the mesiolingual and distobuccal cusps touch.
Y chromosome: A sex
chromosome that when present is found in one copy in the heterogametic
sex, along with an X chromosome, and is not present in the homogametic
sex. Not all organisms with sex chromosomes have a Y chromosome.
yeast artificial chromosome
(YAC): A cloning vector in which DNA fragments several hundred kilobase
pairs long can be cloned in yeast. A YAC is a linear vector with
a yeast telomere at each end, a centromere, a sequence for autonomous
replication in yeast, a selectable marker for yeast, and a polylinker.
Y-intercept: In a regression
analysis, the value of y when x is zero.
Y-linked (holandric
["wholly male"]) trait: A trait due to a mutant gene carried
on the Y chromosome but with no counterpart on the X.
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