Y-chromosome
noun [ C ] uk/ˈwaɪˌkrəʊ.mə.səʊm/ us/ˈwaɪˌkroʊ.mə.soʊm/
Y染色体
a sex chromosome (= structure containing chemical patterns) that exists only in male cells
If a Y-chromosome pairs up with an X-chromosome during fertilization, a male baby will result. 如果受孕过程中一个Y染色体与一个X染色体相结合，则发育为男婴。