Chromosome mutation II

Change in Number One of the major type o chromosome mutation is change in chromosome number. There are two types of numerical changes  (1) Euploidy and (2)Aneuploidy 1. Euploidy: (eu = true, ploidy = set of chromosomes) The number of …

Comparison between rhizome and corm

Rhizome Corm 1.    It is a prostrate, thickened underground stem 2.    It is usually branched and rarely unbranched. 3.    It is elongated in shape. 4.    It contains a less amount of food material. 5.    They are generally perennial and live …

Difference between spine and thorn

Comparison between thorn and spine Spine Thorn Spines are modifications of leaves or parts of leaves. Their function is protection and also prevent excessive water loss. Does not deeply seated and not connected to vascular bundle Exogenous in origin Thorns …

Attenuation

Like regulation by the trp repressor, attenuation is a mechanism for reducing expression of the trp operon when levels of tryptophan are high. However, rather than blocking initiation of transcription, attenuation prevents completion of transcription. When levels of tryptophan are high, attenuation causes RNA polymerase to stop prematurely …