In this essay we will discuss about the examples that illustrates the cases of extra-nuclear inheritance in eukaryotes. Essay # 1. Maternal Inheritance: In certain cases, it has been observed that certain characteristic phenotypic traits of F1, F2 or F3 progeny are not the expression of their own genes, but rather those of the maternal parents. Such phenotypic expressions of [...]
In this article we will discuss about the mechanisms of regulation of transcription in higher eukaryotes. In E. coli, the RNA polymerase holoenzyme (with sigma factor) contains all the information needed to accurately initiate transcription given proper promoter signals (-35 recognition sequence plus -10 Pribnow box). However, RNA polymerase II of eukaryotes, which transcribes most of the protein- encoding nuclear [...]
In this article we will discuss about the DNA replication in eukaryotes. In eukaryotes there are only two different types of DNA polymerases in contrast with DNA polymerase I, II and III of prokaryotes. Furthermore the DNA of eukaryotes is a long linear molecule with several replication units. A diploid mammalian cell contains on an average about 6 pg of [...]