the sense that they have male and female organs on the same individual, either within one flower as in angiosperms (hermaphroditism) or in different flower-like structures on the same individual as in most gymnosperms, or on the prothallium of many ferns (monoecy). In hermaphrodites, the ...
Techniques are now available for the study of meiosis in the human female through the short term culture of oocytes from ovaries. One cell, in which 23 bivalents could be distinguished, shows interstitial chiasmata in the bivalents, in which all four strands can be distinguished. The small ...
Asparagus officinalis (garden asparagus) is a dioecious perennial crop, and the dioecy (i.e., sex) of A. officinalis can affect its productivity. In A. officinalis, flower anthers in female plants fail to accumulate callose around microsporocytes, fail t
Meiosis: Meiosis is the process by which a diploid cell (2n) undergoes division and produces a haploid cell (n). The cells which undergo meiosis are the spermatozoa and the primitive oogonium which are the male and female gametes respectively. ...
(meiosis arrest female 1) as a protein essential for controlling meiosis and retrotransposon surveillance in oocytes; and in contrast to PIWI-pathway mutations, Marf1 mutant females are infertile, whereas mutant males are fertile. Here we put forward the hypothesis that MARF1 in mouse oocytes is ...
Results Oocyte maturation and normal meiosis completion To investigate whether normal meiosis was completed in clone D of Carassius gibelio, we collected different stage maturing oocytes and mature eggs from the artificial induction spawning females. Firstly, the cryo-sections of previous stage oocytes we...
Once sexual development is initiated, the gonad, which comprises both germ cells and somatic cells, differentiates into either a testis or an ovary. A sex-dependent gene regulatory cascade, initiated in the somatic part of the gonad, controls differentiation [30,43,44]. Male and female different...
The X+4 chromosome can thus be regarded as a 'neo-X', and the 1p+4 as a 'neo-Y' chromosome, because of probable lack of recombination in the inverted region. Figure 1 Neo-sex chromosomes of Muntiacus crinifrons. (a) Paring patterns in male and female black muntjacs during meiosis. ...
Results We performed box plot analyses of six functionally important DMRs in fetal muscles of 146 abortions and stillbirths (Figure 1). The analyzed regions represent both primary imprints (H19, LIT1, PEG3, and SNRPN), which are established in the germline and stably maintained after fertilizati...
The widely-used herbicide atrazine (ATZ) is detected in ground and surface water in many countries. Several studies in animals have demonstrated that ATZ has endocrine-disrupting effects on male and female reproduction in many vertebrate species. In this