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Ask QuestionPosted by Rameez Khan 6 years ago
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Posted by Rameez Khan 6 years ago
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Yogita Ingle 6 years ago
Agarose is the most commonly used matrix. It is a natural polymer which is extracted from sea weeds.
Posted by Nancy Verma 6 years ago
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Posted by Dipali Mahajan 6 years ago
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Yogita Ingle 6 years ago
Industrial melanism. It is an example of natural selection shown by peppered moth Biston betularia. The moth had a dull grey coloured body before industrial revolution in England. The colour of moth enabled it to adapt to the light coloured background. After the industrial revolution the environment changed with the deposition of tar soot on the bark of the trees. As a result, light coloured species of moth were easily detected by the predators against the dark bark of trees while the black coloured moth Biston carbonaria increased in number. The change enabled the animal to adjust with the changed environment.
Thus industrial melanism is an interesting example of evidence in favour of natural selection.
However, with the replacement of coal and petroleum by gas and electricity the situation has changed. Thus the white moth has become abundant with a sharp decline in the number of black. The reason being the decrease in pollution and restoration of grey colour on the trees because of the growth of the lichens on the tree trunk.
Riya Rana 6 years ago
Posted by Musician Bisht 6 years ago
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Himam Jani 6 years ago
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Muskaan Vig 6 years ago
Posted by Paridhi Singh 6 years ago
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Meghna Thapar 6 years ago
Competitive release occurs when one of two species competing for the same resource disappears, thereby allowing the remaining competitor to utilize the resource more fully than it could in the presence of the first species. Competitive release is a situation in which an organism is relieved of the stresses associated with competition allowing it to become more dominant in its habitat.
Posted by Shahana Saifi 6 years ago
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Jyotsna Rai 6 years ago
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Harshil Parashar 6 years ago
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Muskaan Vig 6 years ago
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Meghna Thapar 6 years ago
Immune system is a system of our body that consists of different types of cells and molecules which protect our body against pathogens. Our body develops immunity through immune system of our body. Immunity is the ability of the body to defend itself against disease-causing organisms.
Posted by Salman Tapur 6 years ago
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Meghna Thapar 6 years ago
Immunity is the ability of the body to defend itself against disease-causing organisms. The immune system acts as a body’s defence system by protecting our body cells, tissues and organs from invading infection through various lines of defence. Immune System consists of different types of cells and molecules which protect our body against pathogens.
There are two types of immune system:
i. Innate Immune System.
ii. Adaptive Immune System.
Innate Immune System is composed of cells and proteins that are present and always ready to fight against microbes in the infection area. Innate Immune System is present from the time of our birth.
The Adaptive Immune System is required to fight against pathogens that can control innate immune defences. It is also referred to as the Acquired Immune System because it is acquired during the course of life.
Posted by Aditya Chauhan 6 years, 1 month ago
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Muskaan Vig 6 years ago
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Divya Shrivastav 6 years, 1 month ago
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Muskaan Vig 6 years ago
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Vaibhav Srivastava 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Self-pollinating F1 plants produced 1/4 plants of the recessive character and 3/4 plants of the dominant character. This showed that the recessive trait was not lost.
For example - If true breeding Tall [TT] plants are crossed with true breeding short [tt] plants, all the next generation of plants, called F1, are tall. Next, he showed that F1 plants when self-pollinated (or cross- pollinated with other F1 plants) produce an F2 generation with 3/4 of the plants tall and 1/4 short. So the short plants though not appearing in the F1 generation is not lost, but is expressed in homozygous condition.
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Riya Rana 6 years, 1 month ago
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Harshil Parashar 6 years ago
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Abcdefghijklmnopqrstuvwxyz Shekhawat 6 years, 1 month ago
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Somya Sharma 6 years, 1 month ago
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Meghna Thapar 6 years ago
The first restriction endonuclease–Hind II, whose functioning depended on a specific DNA nucleotide sequence was isolated and characterised five years later. It was found that Hind II always cut DNA molecules at a particular point by recognising a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II.The convention for naming these enzymes is the first letter of the name comes from the genes and the second two letters come from the species of the prokaryotic cell from which they were isolated, e.g., EcoRI comes from Escherichia coli RY 13. In EcoRI, the letter ‘R’ is derived from the name of strain. Roman numbers following the names indicate the order in which the enzymes were isolated from that strain of bacteria.
Posted by Garima Dhami 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
i) The desired DNA segment is inserted into a cloning vector and the bacterial cells can be made to take it up after making them competent by treating them with specific concentration of divalent cations such as calcium.
ii) Microinjection
iii) Biolistics or gene gun.
iv) Disarmed pathogen vector
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