Gametogenesis
Concept of gametogenesis, meiosis, spermatogenesis and oogenesis. Gametogenesis in mammals. Structure of the gametes. Sperm, egg and flagella structure. Sperm capacitation and egg cytoplasm. Egg maturation at the time of fertilization in various species.
Подобные документы
- 1. Paracamelus minor (Camelidae, Tylopoda) – a New Camelid Species from the Middle Pliocene of Ukraine
Description of a new species Paracamelus minor location of Odessa catacombs (rustsiny) in the northern Black Sea coast of Ukraine. Features of the structure of a species: small size, moderate swelling of the body of the mandible, a significant reduction.
статья, добавлен 15.04.2014 Study of the structure of water as the basis for the origin of life. The structure of water molecules and hydrogen bonds caused by electrostatic forces and donor-acceptor interactions between neighboring hydrogen and oxygen atoms in water molecules.
статья, добавлен 19.05.2018The properties in Homeostatic systems. System instability, Striving for balance, Unpredictability. Examples of homeostasis in mammals. Regulation of homeostasis. The blood plasma. The main function of platelets. The main function of erythrocytes.
презентация, добавлен 23.02.2015Features of human skin. The concept of the epidermis, its role in protecting the body against aggressive environment. Features of occurrence scar tissue. The structure of the muscular system, the concept of fascia. The mechanism of muscle contraction.
презентация, добавлен 31.10.2017Adaptation of the leaf structure of red juniper growing in the Khizi region of Azerbaijan to various environmental conditions. Measuring the length of leaves taken from different tiers. Identifying an inverse correlation between leaf length and altitude.
статья, добавлен 10.10.2024Description of algicolous fungi Collemopsidium kostikovii, its special characteristics. Narrow outlet, association with soil cyanobacteria - as the main difference between a new species of mushroom from C. Iocarpum, the similarity of their structure.
статья, добавлен 20.07.2018The morphology of the leech (size of the body and gills, structure of the cuticle) and molecular-genetic diversity of the species. Study of its properties, current status in water bodies, and methods of reproduction in natural and laboratory conditions.
статья, добавлен 05.09.2024The description of the Armenian population based on the genetic studies. Mitochondrial DNA as a versatile tool for ethnogenomic studies. Materials and methods collection and genotyping procedures. MtDNA gene pool structure of general Armenian population.
дипломная работа, добавлен 20.04.2015Determination of indices of species richness of Eurytopian beetles and diversity of staphylinid communities of the Ukrainian Carpathians. Study of the originality of the fauna in the forest biotopes of the mountain massifs of Yavirnyk and Polonyn ridge.
статья, добавлен 11.07.2023For the first time, the method of bioclimatic modeling was used to determine the boundaries of the range of occurrence of a potential polemochoral species Avenella flexuosa (L.) Drejer. Maximum entropy modeling of species geographic Distributions.
статья, добавлен 25.02.2021The genus Cedrela in Ecuador has four species. Currently, three species of Cedrela are included in the IUCN Red List. C. odorata and C. nebulosa are listed as vulnerable species and C. fissilis as endangered species. In spite of their status and priority.
статья, добавлен 28.09.2021Species of freshwater red algae, Batrachospermum keratophytum Bory emend. R.G. Sheath, M.L. Vis et K.M. Cole, was record for the first time in the Ukraine. It’s taxonomic position, full description, and locations of B. keratophytum in the Ukraine.
краткое изложение, добавлен 09.04.2014Comprehensive analysis of indicator traits using multivariate statistical analysis for each species. Identification of valuable species and accessions for future selection and application of other genetic programs for oak improvement in the Caucasus.
статья, добавлен 10.10.2024Description of the reasons for the disappearance of types of illegal hunting, deforestation, pollution of water bodies. Statistics reduce some species of animals in Ukraine. The red book as a collection of endangered species of animals and plants.
презентация, добавлен 25.02.2016Field research of tinder fungi in the southeastern part of Belarus to identify rare species for the mycobiota of the republic. Clearing of the status of the rare species Physisporinus crocatus in the mycobiota in the light of the current nomenclature.
статья, добавлен 27.01.202116 species of land mollusks on the territory of the Brest Fortress. A high degree of difference between the species composition of sites with meadow and woody vegetation. Establishing the distribution of mollusks. Soil cover density and type of litter.
статья, добавлен 24.12.2021Conservation of biodiversity is one of the most important problems of our time. As we know, the plant world is important in human life. There are many important plants in the flora of Azerbaijan. Among them, ornamental plants occupy a special place.
статья, добавлен 03.09.2024About the most famous zoo in the world. The first true zoo in France, the modern zoo near Hamburg, the San-Diego Zoo, zoological garden. The Center for Reproduction of Endangered Species. The Animals Of Eurasia and Americas - leopard, monkey, birds, etc.
реферат, добавлен 29.05.2009Evolution before Darwin's on the origin of species. Theory of natural selection. Evolution and anti-evolution in interphase. The Rise of fundamentalism and it's opposition to evolution. From equal time to the de-emphasis of evolution in American schools.
книга, добавлен 21.03.2014The peculiarity of the reduction of natural habitats of rare plant species. Ontogenetic characteristics of some rare and endangered species common in the north-eastern part of the Lesser Caucasus, the state of their coenopopulations were studied.
статья, добавлен 04.09.2024Senecio anastasioi Montesinos, a new species of Asteraceae/Compositae: Senecioneae allied to Senecio ser. Suffruticosi subser. Caespitosi, is described from the Andean regions located in South Peru. The differences between these species are identified.
статья, добавлен 28.09.2023The discovery of new localities of nine species listed in the Red Book of Ukraine, and six regionally rare plant species during expeditionary research on the territory of Volyn region in 2013. The necessity for research phytodiversity Volyn region.
статья, добавлен 27.07.2016- 23. The emergence time and flight routes used by lesser horseshoe bats of radziechowy colony (Poland)
Lesser horseshoe bats are strongly attached to their roosting places; are considered sedentary species, avoiding long-distance migrations. In Poland, their range is limited to mountainous areas, where they prefer overgrown mountain streams for feeding.
статья, добавлен 23.06.2022 General information on the distribution of the new invasive mildew, Podosphaera amelanchieris Maurizio, registered in Belarus, Ukraine. The distribution of fungi, species and morphological characteristics. Comparative characteristics of several species.
статья, добавлен 01.12.2017The paper describes the change in perspective in the composition of the A. messeae taxonomic unit. Initially, based on the disequilibrium ofnatural populations, the species was differentiated into A and B forms using chromosomal inversions as markers.
статья, добавлен 03.08.2021