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Quantitative Characters - Population Density
Density denotes the average number of individuals of a particular species in a unit area. In other words, it represents the numerical strength of a species in a community. A study of density makes it possible to have accurate and direct comparisons of the abundance of species between different areas. Density also gives an idea of the degree of competition between the members of the same species as well as of one species with the other. It is calculated as follows:
Density = Total number of individuals of a species in all the sampling units / Total number of sampling units studied
The value thus obtained is expressed as number of individuals per unit area.
Helix-turn-helix This motif have of two -helices divided by a short (four-amino acid) peptide sequence which forms a -turn that shown in above figure. When
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BACK CROSS When F 1 individual (Tt) is crossed with one of the two parents, either tall (TT) or dwarf (tt), such a cross is called the back cross. There are two possibilities
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