Which condition is most common in the United States?

The chromosomal make-up of a normal male is ______; the chromosomal make-up of a normal female is ______

YY; XY XX; XY XY; XX YY; XX

Jim, who was 60, couldn't understand why he kept slowly gaining weight. He wasn't eating any more than usual and he maintained his regular exercise routine. What explains his weight gain?

His metabolism slowed down by a third between emerging and late adulthood. His intake of water was insufficient, so it was water weight gain. He really wasn't gaining weight; his height was decreasing. His medication increased his appetite though he wasn't aware of it.