Thursday, August 4, 2011 | Written By Administrator
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| What is Metamorphosis insects and frogs |
Metamorphosis, insects, frogs, some species, such as leaving the eggs of the next growth phase undergoes structural changes, it becomes similar to their ancestors.
Many animals, in unstable conditions during development into pupae survive through the preserves.Complete return to normal development of the media and becomes mature.
Larval stage of metamorphism, larvaya consists of the organs. Groups of cells in the adult universe, waits for the larva stage of development. These events are controlled by hormones. Metamorphosis insects, juvenile hormones and plays a role in ekdison. Ekdison hormone, both larvae and pupae and adult stages need to change the skin and allows the occurrence of Metamorphosis. If juvenile hormone, prolongs the period of larval insects.
In animals, the conversion, the full and half-seen in two ways.
Half Transfiguration: This type of living creature metamorphosis, passing through the maturity of the youth observed very little change. These creatures, while the mature form, similar in young, but still very small, wingless, and gender is not developed. As an example, grasshoppers can be given.
Full Metamorphosis: state of larval period, major changes occur until adolescence. A complete metamorphosis, butterflies, moths, flies, etc.. As is seen in insects. This species, the larva or caterpillar is in the wolf periods (depends on the type). They are not like adult become. A number of feathers, leather, etc.. is a result of shifting operations into pupae. At the end of the next development events are transformed into mature individuals.
Ekdison hormone, juvenile hormone if the larvae than the dominant, the skin will continue to change. First, pupae, and then become mature. So ekdison hormone provides early metamorphosis.
If the juvenile hormone-secreting gland is removed, the larvae mature individuals early Metamorphosis and consists of a dwarf.
Metamorphic frogs Frogs metamorphosis, the thyroid gland is provided by the hormone thyroxine. If the frog larvae, and small amounts of thyroid extract, thyroxin is given immediately, and the land is transformed through the dwarf consists of an adult individual. If, however, be issued by the thyroid gland in larvae, larvae of animal remains in continuous and life continues in this way.
Many changes occur during metamorphosis frogs. Larvadaki; tail, pronefroz kidney, gills, mouth parts and the adults instead of losing the function of a cell glands mezonefroz kidney, lung, and consists of many cell skin glands. Herbivor larval period (grass fed), the live, in adult carnivores (meat-fed) diet, and again passes through the teeth of the jaw develops.
Physiological changes observed during metamorphosis. Larvae in the water of oxygen that can hold period hemoglobins, connect the black life, the gaseous oxygen. However, amino acid metabolism as a result of larval period, rather than waste materials are ammonia, which is less toxic than in adults, and occurs with less water dilutable urea. However, vascular layer of the pigments in the eyes that see the past in the water, on land that opinion will change
Wednesday, August 3, 2011 | Written By Administrator
Cell division
Cell division is the process that cells go through in order to divide. Cells may divide for several reasons, and there are two types of cell division depending on the purpose. The cell divisionassociated with sexual reproduction is one type, called meiosis. The other type, the celldivision associated with growth and cell replacement or repair, is called mitosis. In both types of cell division, the nucleus splits and DNA is replicated.
Three types of cell division cell division, the proliferation of single-celled organisms, the growth of multi-celled organisms, male and female gametes to ensure that the biological event occur.
To split a cell reaches a certain size should have, and nucleic acids. The living world, Amitoz (Amitozis).Mitosis (Mitozis) meiosis (Meiosis) has three different types of division. Single-celled organisms usually amitoz division, mitosis and meiosis occurs in many-celled. Usually seen in single-celled species Amitoz that this split will increase the number of individuals.
Amitoz division of cells that extends the kernel, the kernel is divided into two taller, with the nucleolus in the long-drawn boğumlanarak. Following this, the division of the cytoplasm of a cell division occurs to consist of two new puppies. Amitos nuclear envelope is not lost, it does not appear to chromosomes, spindle fibers attach to spindle fibers does not occur. Some special cases outside the highly structured, single-celled organism can be seen in the cells amitoz. In this case, the cells often are sentenced to death, because they can not re-mitosis. Division in cells that degenerate in this organism due to hunger Amitoz sometimes, some of the older cartilage cells, also seen in cells proliferating in the bird embryo blastoderm. Gametes are usually not seen amitoz division. Mitotic cell division is a phenomenon seen in all living things.
The purpose of this event live or in cell division takes place, depending on the cell to form new cells, to ensure renewal and growth. In addition, some organisms, such as eggs and sperm to create sex cells. Prior to the division of a cell, the cell must reach a certain size. Cell division and proliferation of a cell creatures, male and female sex cells, the growth of multicellular organisms required for the occurrence of an event.Mitotic cell division of body cells, including germ cells, to create a meiosis takes place in two different ways.
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| Animal Cell Division |
During cell mitosis, as shown in the top division in mitosis through consecutive stages that different to be considered a single-celled growth, is used for multi-celled growth. Healing of injured cells in mitosis and is worn with. Chromosome information consisting of the same cells. During the rapid growth of mitosis. Nerve, the sperm and egg cells, mitosis is not.
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Atomic building block of matter, the building blocks of all living things in the cell in the universe. Single-celled organisms, all vital activity and ends in a single cell. Groups of cells within multicellular organisms form different structures etmesiyle tissues, organs, tissues come side by side, to a combination of organs, systems, systems of the organism occurs in the community. Thus, each cell of the organism to be a certain task in a system with lirli tavzif would have taken place as is.
Cells are living in a social subject. Cells with other cell populations, in community with other communities made on the basis of each cell are found in the relationship. Dependent on the cells located within each community, a balance that is vital cells are found in other communities. Without disturbing the harmony of each cell through the cell alakaları made on the basis of this universe of billions of living things act in accordance with current laws Traditional magnificent vital activities of cells with different forms and serve as mutual assistance, solidarity, unity and togetherness is provided with.
Tuesday, August 2, 2011 | Written By Administrator
Population, density and distribution of digital assets of all kinds live. Although the population for English as the term is frequently used in biology and sociology.
Population: a collection of individuals belonging to the same species living within a specific region. Genre:Capable of producing offspring from a common ancestor mate productive individuals.
What is the Population ?
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Gene - BiologyGene, a unit of heredity. Genome sequence of identifiable location, transcribed, regulatory and / or the functional areas of a region.
With the complexities of gene regulation and transcription, according to a new gene and a recognition of the self, "the same class (protein or RNA), functional products that encrypt, potentially overlapping, the combination of genome sequences." Gene, the basic physical and functional unit of heredity. Every gene, protein or RNA molecule with a specific function, such as the nucleotide sequences of chromosomes consists of a certain point. Classical genetics, the same biological functions according to deter them to a not managed and mutual recombination of alleles and genes are not allelic. Allelic genes, genes that are effective on the same property. Classical genetics the gene is used as a sub-unit.
