It must have struck most naturalists as a strange anomaly that, in the case of both animals and plants, species of the same family and even of the same genus, though agreeing closely with each other in almost their whole organisation, yet are not rarely, some of them hermaphrodites, and some of them unisexual
. But if, in fact, all hermaphrodites do occasionally intercross with other individuals, the difference between hermaphrodites and unisexual
species, as far as function is concerned, becomes very small.
Some people are so besotted by themselves that they've now become the latest manifestation of self admiration and now describe themselves as unisexual
or an 'autoromantic' - or, to be more specific, they've found the perfect partner, and it's the man in the mirror.
La edad se determino indirectamente a partir de la distribucion de frecuencias de talla de una muestra unica unisexual
de 98 peces, obtenida a partir de un muestreo aleatorio estratificado por mes (entre enero y diciembre) durante el ano 2011.
The flowers are generally perfect (containing both male and female reproductive organs in the same flower) or sometimes unisexual
. They are arranged in inflorescences, which facilitates pollination by insects such as small flies and bees .
Some Ascarina species have the simplest possible unisexual
flowers, which consist of one stamen or one carpel containing one ovule, borne in the axils of bracts in spicate inflorescences, although others have stamen numbers ranging from two to five, lateral bracts associated with the stamen and/or carpel, groups of two carpels, or both a stamen and a carpel (Swamy, 1953; Smith, 1976, 1981; Moore, 1977; Jeremie, 1980).
Allozyme analysis of clonal diversity among unisexual
hybrids of the killifishes Fundulus diaphanus and F.
impaternata is a unisexual
clonal species of hybrid origin, arguably with a gynogenetic mode of reproduction in which (i) the parthenogenetic production of diploid female eggs by its queens is spermdependent, requiring allospecific copulation followed by interaction without fertilisation between their unreduced oocytes and nonconspecific sperm cells and (ii) sperm necessary for this purpose is likely acquired by the gynes through copulation with technically allospecific males produced from eggs laid by impaternata queens and reared in impaternata nests.
Up to one-third of infected deer examined in northeastern Minnesota had unisexual
, sterile infections (Slomke et al.
In bath sponge, the flowers are unisexual
and the female flower has more than 1000 ovules .
Role of Local Adaptation in the Unique Reproduction Mode of Unisexual
sphenanthera, the unisexual
non-rewarding female flower is similar in appearance to the pollen rewarding male flower and uses visual or olfactory cues to attract pollinators (Yuan et al., 2007; Du et al., 2012).
Other coenanthia had only staminate flowers ([bar.X] = 941 [+ or -] 63.2), being therefore unisexual