In this article we will discuss about the definition of cistron. The earlier geneticists considered a gene to be the smallest unit (a bead or a chromomere) on a chromosome which could be distinguished as a functional unit, or as a unit of recombination, or as a unit of mutation. It was also believed that crossing over occurred only between [...]
In this article we will discuss about the concept of gene conversion. In eukaryotes reciprocal exchange between loci almost always produces reciprocal recombinants. In Neurospora the linear arrangement of ascospores in the ascus indicates directly which strands have exchanged segments during crossing over. Thus after meiosis in a heterozygote Aa, due to reciprocal exchange the 8 ascospores are arranged in [...]
The below mentioned article provides a note on overlapping genes. It is now becoming apparent that in both prokaryotes and eukaryotes a nucleotide sequence can code for more than one protein. The nucleotide sequence of a gene may be translated into a complete polypeptide chain. Then a part of the same sequence may also code for another protein of a [...]