Previous study demonstrated that the nuclear chromatin of sperm cells contains high quantity of thiol-enriched protamines, and flagella of sperms is enriched with thiols; therefore, the male gametes are vulnerable to arsenic-induced damage60. The capacity of arsenic to attach with the thiol ...
A polyploid of hybrid origin in which there are four copies of each homologous chromosome per cell, two derived from each parent species. ANISOGAMOUS A form of reproduction in which the male gametes are a different size to the female gametes. ...
The reproductive organ of male animals, in which sperm and the sex hormones (androgens) are produced. Vertebrates have two testes, which in most animals are contained inside the body. In many mammals, they lie outside the body and are enclosed by the scrotum. ...
9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook male heterogamety [′māl ¦hed·ə·rō¦gam·əd·ē] (genetics) The production by males of some species, such as humans andDrosophila, of two types of gametes that differ in their sex chromosome...
In sexual reproduction of plants, where are the male gametes produced? A. In the ovary B. In the stigma C. In the anther D. In the style 相关知识点: 试题来源: 解析 C。解析:在植物的有性繁殖中,雄配子是在花药(anther)中产生的。选项A,卵巢(ovary)是产生雌配子和孕育种子的地方;选项B,...
It is without forgetting that gametes since their beginning as spermatogonia are quasi syncytial as they connect with cytoplasmic bridges until spermiation, excising each perikaryon and excessive cytoplasm, making them male motile gametes [[147], [148], [149], [150], [151], [152],170,[294...
Attraction of male gametes of Allomyces to sirenin concentrations as low as 10-10M has been demonstrated. Increasingly strong responses are observed to concentrations up to 10-6M. The response is slightly weaker at 10-5M and very weak at 10-4M. Microscopic studies suggest that the attraction ...
Gametogenesis is the biological process that gives rise to gametes: oocytes in the case of female oogenesis and spermatozoa in the case of male spermatogenesis. Spermatogenesis comprises at least three functional processes: (i) proliferation of spermatogonia (stem germ cells), (ii) meiosis of ...
Proteins on the surfaces of the sperm, egg, central, and synergid cells might be important for guidance and recognition/fusion of the gametes. Here, we present functional analyses of Arabidopsis GEX3 which encodes a plasma membrane-localized protein that has homologs in other plants. GEX3 is ...
In species with gonochoristic sex, i.e. species in which individuals are either male or female (in contrast to hermaphrodite species, in which individuals produce both male and female gametes), different factors can control sex determination (SD) [29,30]. Some species undergo environmental sex...