In this article we will discuss about the aneuploidy in drosophila and humans. Aneuploidy in Drosophila: The strain of attached X-females further explains the consequences of aneuploidy. Besides sex chromosomes, autosomes in Drosophila can also have nondisjunction. The tiny dot-like chromosome 4 if present in the trisomic state produces viable but phenotypically deformed offspring. But if one of the very [...]
In this article we will discuss about the meaning and classification of euploidy. Meaning of Euploidy: Most diploid sexually reproducing organisms have an alternation between a haploid and a diploid state in the life cycle. The haploid state, mostly confined to germ cells, is characterised by the presence of a single set of chromosomes (n). When two haploid germ cells [...]
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 [...]