Plant reproductive morphology be identical isospores or come in different sizes (microspores and megaspores), but strictly speaking, spores and sporophytes are neither male nor female because they do not produce gametes. The alternate generation, the gametophyte, produces gametes, eggs and/or sperm. A gametophyte can be monoicous (bisexual), producing both eggs and sperm or dioicous (unisexual), either female (producing eggs) or male (producing sperm). In the bryophytes (liverworts, mosses and hornworts), the sexual gametophyte is the dominant generation. In ferns and seed plants (including cycads, conifers, flowering plants, etc.) the sporophyte is the dominant generation. The obvious visible plant, whether a small herb or
Second-generation immigrants in the United States dominant norm of mainstream U.S. society. Despite the barriers that come from being born to immigrants who are generally low skilled, have little education, and have less knowledge of the English language compared to U.S. natives, second-generation immigrants are doing better than U.S. native groups of comparable racial backgrounds, contradicting the concept of downward assimilation. A major factor that contributes to second-generation immigrants doing so well is the drive to succeed and do better than their predecessors that is commonly instilled in these immigrants from childhood by their families. The theory of segment assimilation undermines such early socialization. Second-generation immigrants