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Yogita Ingle 7 years, 2 months ago
Polymerase chain reaction (PCR) is a common laboratory technique used to make many copies (millions or billions!) of a particular region of DNA. This DNA region can be anything the experimenter is interested in. For example, it might be a gene whose function a researcher wants to understand, or a genetic marker used by forensic scientists to match crime scene DNA with suspects.
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Yogita Ingle 7 years, 2 months ago
Follicular atresia is the breakdown of the ovarian follicles, which consist of an oocyte surrounded by granulosa cells and internal and external theca cells. It occurs continually throughout a woman's life, as she is born with millions of follicles but will only ovulate around 400 times in her lifetime. Typically around 20 follicles mature each month but only a single follicle is ovulated; the follicle from which the oocyte was released becomes the corpus luteum. The rest undergo follicular atresia.
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Yogita Ingle 7 years, 2 months ago
DNA fingerprinting is the technique developed by Alec Jeffreys, it is used for comparing the DNA sequence of two individuals by identifying differences in the repetitive DNA sequences of the individuals.
Applications of DNA Fingerprinting
1. Paternity disputes can be solved by DNA fingerprinting.
2. Evolutionary relation between the species.
3. It can be used in determining population and genetic diversities .
4.It is very useful in the detection of crime and legal pursuits.
Posted by Jyoti Kumari 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Reforestation mainly refers to the replanting of plants on those land which has been destroyed for the benefits of mankind.
Reforestation is not similar to afforestation. Afforestation mainly refers to the planting of trees, whereas, Reforestation, refers to the replanting of trees. The goals of both afforestation and reforestation are the same.
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Latitudinal gradients: Species diversity generally decreases as we move away from the equator towards the poles. Tropics have more species than temperate or polar areas. Many hypotheses have been proposed by scientists to explain greater diversity in the tropics. They are as follows:
- Speciation is generally a function of time. Temperate regions had been subjected to frequent glaciations in the past. But tropical latitudes have remained relatively undisturbed for millions of years. This allowed a long evolutionary time for species diversification in the tropics.
- Tropical environments are less seasonal, relatively more constant and predictable. A constant environment promotes niche specialization, and leads to a greater species diversity.
- More solar energy is available in the tropics. It contributes to higher productivity. It may have indirectly contributed to greater diversity in the tropics.
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Yogita Ingle 7 years, 2 months ago
Algae are photosynthetic microorganisms that are found in most aquatic habitats. Algae love runoff nutrients, and an algae bloom occurs when nutrient pollution and lots of sunlight create a rapid increase in the density of the algae. The presence of large amounts of nutrients in water leads to algal bloom. These nutrients (nitrogen and phosphorus) are added to water bodies from fertilisers that get issolved in soil and are washed off by water bodies. To prevent the algal bloom, the farmers instead of using chemical nutrients must start using natural products like manures produced using vermicomposting.
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Yogita Ingle 7 years, 2 months ago
In pond phytoplanktons are producers, small fishes are herbivores and large fishes are carnivores. When we look at there biomasses large fishes (carnivores) have larger biomass as compared to small fishes (herbivores), and small fishes has larger biomass as compared to the biomass of phytoplanktons (producers). Hence when we construct a pyramid of biomass of pond ecosystem it comes out to be inverted.
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