1.One of the paired male reproductive organs that produce spermatozoa and male sex hormones in humans and other vertebrates. 2.An analogous gland in an invertebrate animal, such as a flatworm or a mollusk. [Latin,witness, testis; seetestify.] ...
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 content. ...
a.Relating to or designating organs, such as anthers or antheridia, that produce gametes capable of fertilizing those produced by female organs. b.Bearing stamens but not pistils; staminate:male flowers. 4.Designating an object, such as an electric plug, designed for insertion into another par...
In mice and humans, the production of male gametes is a result of a complex multistep process of stem cell differentiation. The final product, the mature spermatozoon, is designed for the safe delivery of a haploid copy of the paternal genetic information to the oocyte in a structural state ...
The gametes in humans are haploid as they contain 23 chromosomes. Each of this chromosome exists in a pair which are present in diploid cells. The chromosome number that is present in a single set can be represented as ‘n’, where ‘n’ is also known as the haploid number. In the cas...
The number of male gametes is critical for reproductive success and varies between and within species. The evolutionary reduction of the number of pollen grains encompassing the male gametes is widespread in selfing plants. Here, we employ genome-wide association study (GWAS) to identify underlying...
The sperm and the egg, which are the male and female gametes, meet during fertilization. Both gametes are haploid cells; these cells contain 23 unpaired chromosomes, which is half of the human genetic… Read MoreThe Testes Typically, males have two testes. The testes are contained within...
Evolutionary theory predicts that the sex ratio of Plasmodium gametocytes will be determined by the number of gametes produced per male gametocyte (male fecundity), parasite clonal diversity and any factor that reduces male gametes' ability to find and combine with female gametes. Despite the import...
How the brain regulates hormone production in humans Gonadotropins, also known as hypophyseal hormones, are listed below: FSH Follicle-stimulating hormone. It stimulates the gonads to produce gametes, that is, eggs and sperm. LH Luteinizing hormone. Also acts over the gonads, but has other functi...
It occurs when one sex competes for fertilization of the gametes of another sex. Sexual selection can be divided into two major forms: intrasexual selection and intersexual selection. Intrasexual selection occurs when members of one sex compete among each other for access to potential mates. Male...