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Mutations and genetic recombination (in sexually reproducing organisms) are major sources of variations in natural populations, In this section we will briefly mention the various types of mutations, their rates and how they are caused.
The term mutation is used to designate the process by which changes arise in the genetic material and, the end products of such processes. Mritations form a separate category of sources of variability, distinct' from variability arising from genetic recombination or independent assortment of chromosomes, characteristic of sexually reproducing individuals. There are two categories of mutations. '(1) Chromosomal mutations which affect the'number of chromosomes and the number or the arrangement of gencs in a chromosome; (2) gene mutations which affect only one or a few nucleotides in a gcne. We shall now tiiscuss these two aspects of mutaion.
Dextrin Polymers of D-glucose, formed due to partial hydrolysis of starch by enzymes.
a nutrient agar plate labelled 10^(-5)ml had 154 colonies after incubated. what is the cell density in the original sample
Carbohydrates These form about 1%part of protoplasm, they are comparatively simpler compounds of carbon, hydrogen and oxygen in the ratio 1:2:1 The ratio hydrogen to oxygen is
General characteristics of phylum
H y p o ma g n e s e m i a It is also known as grass staggers or lactation or grass tetany and results in clonic and tonic muscular spasms and convulsions. E
why phloem made of living cells
What happens to the movement of molecules at equilibrium? At equilibrium, the movement of molecules continues, but because there is no concentration gradient, there is no net m
Q. What are the main factors that affect the growth of a population? The major factors that make populations grow are births and immigration. The major factors that make popula
Define role of Vitamin D in controlling gene expression? Vitamin D is a secosteroid that is metabolically activated and degraded through the actions of three cytochrome P450 hy
Hypoglycaemia Unawareness ? Some people with diabetes do not have early warning signs of low blood glucose, a condition called hypoglycemia unawareness. ? This conditio
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