Tag Archives | Chromosome Number

Aneuploidy in Animals | Chromosome Number

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 [...]

By |2016-07-12T13:51:00+00:00July 12, 2016|Chromosome Number|Comments Off on Aneuploidy in Animals | Chromosome Number

Aneuploidy: Classification and Origin

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 [...]

By |2016-07-12T13:51:00+00:00July 12, 2016|Chromosome Number|Comments Off on Aneuploidy: Classification and Origin

3 Main Types of Allopolyploidy

The following points highlight the three main types of allopolyploidy. The types are: 1. Segmental Allopolyploidy 2. Genome Allopolyploidy 3. Auto-Allopolyploidy. Type # 1. Segmental Allopolyploidy: Some degree of homology (partial homology) may exist between some chromosome of one genome and those of the other genome. Therefore, in such polyploids both bivalents and multivalents are formed. This type of chromosome [...]

By |2016-07-12T13:50:59+00:00July 12, 2016|Chromosome Number|Comments Off on 3 Main Types of Allopolyploidy
Go to Top