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Meghna Thapar 5 years, 6 months ago
Pollen grains are microscopic structures that vary in size and shape. This is important because inside this tough shell lie two cells: the tube cell, which will eventually become the pollen tube, and a generative cell, which contains the male sperm nuclei needed for fertilization. Only after pollination, when pollen has landed on the stigma of a suitable flower of the same species, can a chain of events happen that ends in the making of seeds. A pollen grain on the stigma grows a tiny tube, all the way down the style to the ovary. ... The ovary develops into a fruit to protect the seed.
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Aabidha Anand 6 years, 5 months ago
NACO stands for National Aids Control Organization.<wbr />
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Mendel selected garden pea for his experiment for the following reasons-
Easy to Cultivate: Pea plant (Pisum sativum) was easy to cultivate. It grew well in his garden.
Hermaphrodite: Its flowers were hermaphrodite I.e. pea plant have both male and female sexual organs.
Cross-fertilization (Cross-Pollination) Easily Controlled: It was normally self-fertilizing (self-pollinating) that is the fertilization of plants and some invertebrate animals by their own pollen or sperm rather than that of another individual, but could also be cross fertilized (cross-pollinated) that is the transfer of pollen grains from an anther of a flower of one plant to a stigma of a flower of another plant of the same species.
Short Generation Time: As the time gap between generations was short, Mendel could raise many generations of pea within a short time. This is one of the main reason for choosing Pea plant (Pisum sativum).
Many Distinct Traits: Pea had many sharply distinct. its each trait had two clear cut alternative forms or varieties: e.g. seed shape had a round or wrinkled phenotype, plant height was either tall or short, seed color could be yellow or green etc. Mendel called them pair of contrasting traits. He focused on seven such contrasting pair of traits.
Mangal Patidar 6 years, 5 months ago
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Meghna Thapar 5 years, 8 months ago
Tapetal cells are very large cells with more than one nucleus. They assist with pollen grain growth and development. Tapetal cells undergo endomitosis where the nucleus in the nuclear membrane splits, but cytokinesis does not happen. They become bi / multinucleate because of this. The tapetum is a specialised layer of nutritive cells found within the anther, of flowering plants, where it is located between the sporangenous tissue and the anther wall. Tapetum is important for the nutrition and development of pollen grains, as well as a source of precursors for the pollen coat.
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Meghna Thapar 5 years, 8 months ago
The new plant uses recombinant DNA (rDNA) technology to produce insulin by a cell-based fermentation method. Human recombinant insulin is produced by inserting the insulin gene into a suitable vector. The most readily amenable is a non-pathogenic weakened strain of the common bacterium E. The gene for human insulin is inserted into the gap in the plasmid. This plasmid is now genetically modified. The genetically modified plasmid is introduced into a new bacteria or yeast cell. This cell then divides rapidly and starts making insulin.
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Yogita Ingle 6 years, 5 months ago
Insulin from an animal source, though it caused some patients to develop allergy or other types of reactions to the foreign protein. Insulin consists of two short polypeptide chains : chain a and chain b, which are linked together by disulphide bridges. In mammals, including humans, insulin is synthesized as a pro-hormone, which contains an extra stretch called the C-peptide.
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