Uteri were carefully laid on a glass plate and placed on the stage of a dissecting microscope. Namespaces Article Talk. In order to confirm the presence of apoptosis in DB, the presence of the activated form of caspase-3 was measured by Western analysis Fig.
Sinauer Associates, Inc. Journal of Neonatal Surgery. This pair contains an X sex chromosome from the female egg and either an X or a Y sex chromosome from the male sperm. Retrieved 7 April From Wikipedia, the free encyclopedia. Within the mushroom diploid cells are formed, later dividing into haploid spores.
Mating can occur only with entwined tails, thus placing the male and female vents together for insertion of the penis.
In female mammals the vagina connects with the uterusan organ which directly supports the development of a fertilized embryo within a process called gestation. Genetic sex-determination usually depends on asymmetrically inherited sex chromosomes which carry genetic features that influence development ; sex may be determined either by the presence of a sex chromosome or by how many the organism has.
Multicellularity: Evolution of Differentiation". Sinauer Associates, Inc. Orthoptera: Gryllidae ". Main article: Evolution of sexual reproduction. To accomplish internal copulation, certain body and organic adaptations are necessary.
Categorizing Memory: Study. The same mechanism may apply to specific higher cognitive functions, if they are associated with some male advantage in adaptation 1. Skaletsky, H. Mol Hum Reprod.