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Related to heterogametic sex: homogametic
heterogametic sexthe sex of a particular organism that contains within each nucleus one X-chromosome and one Y-chromosome (or just one X-chromosome), and therefore produces two different types of gamete with respect to the SEX CHROMOSOMES. Usually the male is the heterogametic sex but in some organisms (e.g. birds), it is the female. Since the sex chromosomes usually are responsible for SEX DETERMINATION, it is the heterogametic parent that controls the sex of the offspring.
the sex which produces gametes containing dissimilar sex chromosomes, i.e. males in all mammalian species.