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A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z

Y

Y chromosome

In mammals, the chromosome that carries the gene determining maleness. [More]

Yeast

A unicellular fungus. One species, the budding yeast Saccharomyces cerevisiae, is used in brewing and baking because of the ease with which it ferments carbohydrates to ethyl alcohol and carbon dioxide.

Yolk sac