Donor contribution is illustrated by GFP green expression. The origin of microRNAs of Schistosoma mansoni. Spermatogenesis spermatogonium spermatocyte spermatid sperm Oogenesis oogonium oocyte ootid ovum Germ cell gonocyte gamete. Female guppies prefer brightly colored males to duller males.
Sex chromosomes showed a paucity of female-biased genes, as predicted by theoretical evolutionary models. Common and easily identified types of dimorphism consist of ornamentation and coloration, though not always apparent. From these analyses, I conclude that both male- and female-biased microRNAs are mostly associated with the reproductive function.
Gonadal chimeras were generated by transplantation of sections of presumptive mesoderm from green fluorescent protein GFP -expressing embryos 23 at developmental stage 12 day 2 to replace the equivalent tissue of non-GFP embryos at the same stage of development Fig 4a.
Evolution of sexual reproduction Anisogamy Isogamy Germ cell Meiosis Gametogenesis Spermatogenesis Oogenesis Gamete spermatozoon ovum Fertilization External fertilization Internal fertilization Sexual selection Plant reproduction Fungal reproduction Sexual reproduction in animals Sexual intercourse Copulation Human reproduction Lordosis behavior Pelvic thrust.
Mosses of Eastern North America. Rapid evolution of mammalian X-linked testis microRNAs. It has been proposed that the earliest sexual dimorphism is the size differentiation of sperm and eggs anisogamybut the evolutionary significance of sexual dimorphism is more complex than that would suggest.
Look up sexual dimorphism in Wiktionary, the free dictionary.
Elgar Trends in Ecology and Evolution. Webster, Claire W. In addition to the gonads, donor cells were observed in a variety of tissues including skin, muscle, mesonephros, Wolffian duct and Mullerian duct. Australian Journal of Zoology.
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