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Q. Why is meiosis significant 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 compulsory in some phase of the life cycle of a species that reproduces sexually. If that could not occur in each generation, whenever a zygote is formed by fusion of gametes there would be duplication in the quantity of chromosomes in a geometric progression.
How does the plant cell wall react when it is placed under hypotonic medium? Ans) The plant cell wall (the covering of the cell outside to the cell membrane) is made of cellulos
Name three effects that inbreeding can have on a population. Inbreeding can decrease the number of offspring produced, increase susceptibility to disease, reduce genetic varia
The second maturation division of the mammalian ovum occurs: 1. Shortly after ovulation before the ovum makes entry into the Fallopian tube 2. Until after the ovum has been p
Q. What do you mean by Punch cards? Punch cards are used when the number of taxa to be keyed out is large. In this type of cards the holes at numbers corresponding to a charact
THEORIES TO EXPLAIN FINE STRUCTURE OF CHROMOSOME (1 ) Multistranded theory Steffenson 1959 - each chromosome composed of two chromatids (Half Chromosome) and each chromat
Define tuberculosis Tuberculosis (TB) is still a problem in the United States, even though the incidence continues to decline in most of the country. Treatment of TB can be div
how atoms are arranged to work in DNA?
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Injection Route An injection is an unpleasant experience for a person at any age and is particularly traumatic to the small child who often lives in fear to the next "need
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