In this article we will discuss about the aneuploidy in animals. Aneuploidy of sex chromosomes and autosomes have been reported in several animals. Nondisjunction is major source of aneuploid gametes Sturtevant reported that trisomic for chromosome 4 (triplo-IV) in Drosophila melanogaster ABCDEFGH was fertile in the female sex. In mouse, trisomics were found to be sterile or semi-sterile, but their [...]
In this article we will discuss about:- 1. Types of Duplications 2. Origin of Duplications 3. Chromosome Pairing 4. Phenotypic Effects of Duplications 5. Duplications in Human 6. Uses of Duplications. Types of Duplications: Broadly, duplications are divided into two types which are further subdivided into different subtypes. 1. Inter-Chromosomal duplication: The duplicated segment of a chromosome is present in [...]
In this article we will discuss about the classification and origin of aneuploidy in chromosomes. Classification of Aneuploidy: Broadly, aneuploids may be divided into the following two classes (a) hypoploid and (b) hyperploid. In a hypoploid, the chromosome number is lower than the euploid number, whereas in a hyperploid it is greater than the euploid number. A detailed classification of [...]