HUMAN BIOLOGY

I-52 Index 

n Wrinkles, facial, Botox injections
for, 111
“Wrist bone,” 94
Wrist joint, 94, 107
n Writer’s cramp, 107

X
X chromosomes, 355, 355f, 387f
n disorders linked to, 389, 389f,
394–395, 394f, 395f, 401t,
407, 407f
embryo development affected by,
339, 339f
genes on, 388–389, 389f, 394–395,
394f, 395f
number of, 398–399, 399f
structure and function of, 385,
388–389, 388f, 389f
X inactivation, 389, 389f
n X-linked disorders, 284, 389,
389f, 394–395, 394f, 395f,
401t, 407, 407f

X-linked genes, 388–389

n XO condition (Turner syndrome),

398–399, 399f, 401t

n X-rays, 361, 361f, 372, 429, 432

n XXX syndrome, 399, 399f, 401t

n XXY syndrome, 399, 399f, 401t

n XYY condition, 399, 401t

Y

Y chromosomes, 355, 355f, 387f

embryo development and,

339, 339f

genes on, 388–389

number of, 399, 399f

structure and function of, 386,

388–389, 388f, 389f

Yeast, 448f

n Yeast infections, 160, 172, 323

Yersinia pestis, 474

Y-linked genes, 388–389

Yolk sac, 334f, 336, 336f, 338f–339f

Yoruba people, 333, 333f

Z

n ZIFT (zygote intrafallopian

transfer), 319

Zijlaard, Leontien, 219f

n Zinc, in diet, 194, 215t

Z line (muscle cell sarcomeres), 108,

108f, 110f

Zona pellucida, 308, 315, 315f, 332, 333f

Zygomatic bone, 92, 92f–93f, 101

Zygomaticus major, 118, 118f

Zygote, 315, 315f, 318, 319, 330, 330f,

331f, 332, 332f, 347t, 362

n Zygote intrafallopian transfer

(ZIFT), 319

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