题目

Erik Weihenmayer was born with an eye disorder. As a child his eyesight became worse and then, at the age of 13, he lost his sight completely. However, he did not lost his determination to lead a full and active life. Erik became an adventurer. He took up parachuting, wrestling and diving. He competed in long-distance biking, marathons and skiing. His favorite sport, though, is mountaineering. As a young man, Erik started to climb mountains. He reached the summit of Mount McKinley in 1995 and then climbed the dangerous 1000-meter rock wall of EI Capitan. Two years later, while climbing Mount K5．下列关于单倍体的说法正确的是（　　）A．单倍体的体细胞中只含有一个染色体组B．在自然条件下，动物中也存在单倍体个体C．含有奇数个染色体组的个体一定是单倍体D．单倍体都不能产生配子，都表现为高度不育