Y chromosome
From Longman Dictionary of Contemporary EnglishRelated topics: Microbes, genetics, biochemY chromosomeY chro‧mo‧some /ˈwaɪ ˌkrəʊməsəʊm $ -ˌkroʊməsoʊm/ noun [countable] HBMthe part of a gene that makes someone a male instead of a female → X chromosomeExamples from the CorpusY chromosome• The fetus becomes male only when it both has a Y chromosome and is acted upon by androgenic hormones.• In man, for instance, the genes that control gender are on the Y chromosome.