In this article we will discuss about the paracentric inversion in chromosome. Chromosome Pairing and Crossing Over: In paracentric inversions chromosome pairing occurs by loop formation in the inverted region; the centromere remains outside the loop. Crossing over in the loop causes the formation of dicentric chromatids which produce bridges at anaphase. Chromatid bridges may be formed at AI or [...]
In this article we will discuss about:- 1. Meaning of Pericentric Inversion 2. Chromosome Morphology 3. Occurrence of Pericentric Inversion. Meaning of Pericentric Inversion: When the inverted segment is large, a loop is formed during synapsis and centromere is included in the loop. Crossing over in the loop causes the formation of deficiency-duplication chromatids. Chromosome pairing and crossing over positions [...]
In this article we will discuss about the inversions in natural populations which is caused when the genes in a section of a chromosome is reversed. Inversions occur spontaneously in a large number of plant and animal species. But the most extensive work has been done in Drosophila in which they have been detected in a rather high frequency. In [...]