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Why is meiosis important for the maintenance of the normal quantity of chromosomes of a species with sexual reproduction?
A reduction to a half of the maximum normal quantity of chromosomes is mandatory in some phase of the life cycle of a species that reproduces sexually. If that could not occur in every generation, whenever a zygote is created by fusion of gametes there would be duplication in the quantity of chromosomes in a geometric progression.
Determine about the visual axes of eyes In normal eyes, the visual axes are parallel to each other in the primary position of gaze. This position is usually maintained but in t
Define two ways in which genetic recombination occurs during meiosis. Genetic recombination happens during crossing- over and independent assortment.
Q. How different are gymnosperms from pteridophytes and bryophytes? Gymnosperms are not cryptogamic as pteridophytes and bryophytes are. They are phanerogamic and so they form
Bronchial Asthma Bronchial Asthma is characterized by increased responsiveness of the trachea and bronchi to various stimuli that cause narrowing of the airways and difficu
What are the factors that limit our ability to fully classify and understand microbial diversity and what implications do these challenges have for environmental and health managem
Where in the leaves is the photosynthetic tissue often located? The major photosynthetic tissue is the photosynthetic parenchyma (also called as chlorenchyma, do not confuse wi
Response to Cold - Responses of Plants to Stress Let us first see what happen to a plant when it is exposed to a cold climate with temperatures below 0°C. If the temperature i
Explain Interaction of pyridoxine with Carbohydrates? Pyridoxine is involved in glyconeogenesis through its action in transaminase reactions. Low levels of pyridoxine impair gl
What is the other name given to sex chromosomes? Sex chromosomes are also known as allosomes (the other chromosomes that are not sex chromosomes are known as autosomes).
Q. What is the energy source used in active transport through biological membranes? The energy necessary for active transport against the concentration gradient of the transpor
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