Introduction. Pollination is the transfer of pollen grains from a male part of a plant to a female part of a plant. This later enables fertilization of the plant and the production of seeds. The transfer is most often facilitated by an animal or by the wind, which is the pollinating agents. Examples of … Read more
Introduction. Ecosystems maintain themselves from the flow of energy through different trophic levels in an ecosystem. The cycling energy and nutrients obtained from different external sources sustain the ecosystem. Energy flow is depicted by the use of food chains, food webs, and ecological pyramids Trophic level. In an ecosystem, there exist, several feeding groups, each … Read more
The species which are likely to become extinct shortly are categorized as the endangered species. These species are at the risk of extinction due to the loss of its critical habitat, or due to the sudden decrease in the number of individuals. Any species that was previously threatened with extinction can be regarded as … Read more
Polygenic inheritance refers to the kind of inheritance in which a single inherited phenotypic trait is produced and controlled by multiple genes. It is also known as quantitative or multi-factorial inheritance. Each gene contributing for a particular trait in polygenic inheritance has a small but addictive effect individually and exhibit incomplete dominance unlike Mendelian … Read more
Ecological succession is the gradual process through which ecosystems change and develop over a given time frame. This process occurs in no particular direction and aims at establishing a stable community. The resultant final community is, therefore called the climax community. Seral stages are the individual stages of succession, they are not discrete but a … Read more
Ecological Services The plants provides us with the essential services we have a tendency to need for life. These services are called ecological services – the interactions among organisms and their natural environments, including the cycling of water and basic nutrients that humans are able to use and capitalize on. Ecological services include: Purification of … Read more
Adaptation is the evolutionary process by which organisms become fitted to their environment as a result of natural selection. Natural selection acts upon organisms over several generations enabling them to develop adaptive traits with a role in these organisms. Such traits enable organisms to fit into their specific environment. Types of Adaptations There are three … Read more
Down syndrome as a disorder in genetic in human being occurs when an error in cell division results in an extra chromosome 21. Down syndrome affects physical growth and a person’s cognitive ability, cause mild to moderate developmental issues, which usually result in a health problem. With the help of a series of screenings … Read more
In the year 1898, Sergius Nawaschin seconded a few months later by Leon Guignard(1899) suggested that fertilization is double in Lilium martagon and Fritillaria tenella. It was then believed that indeed it occurs in flowering plants. This is a complex fertilization mechanism that occurs in angiosperm (flowering plants). It involves the joining of a … Read more
Introduction DNA replication is the biological process involved in the production of two identical replicas of DNA from an original DNA molecule. It is, therefore, the basis of biological inheritance and thus occurs in all living organisms on Earth. During each cell division, two daughter cells are formed, which must contain the same genetic … Read more