In this article we will discuss about the Meaning and Types of Euploidy. Meaning of Euploidy: Euploldy is the presence of chromosome number which is the multiple of the basic chromosome set. An organism with the basic chromosome number 7, may have euploids with chromosome number 7, 14, 21, 28, 35, 42. Euploids are further of different types - monoploids, [...]
In this article we will discuss about:- 1. Distribution and Occurrence of Polyploidy 2. Classification of Polyploidy. Distribution and Occurrence of Polyploidy: Polyploidy is wide spread in plant kingdom but is less common in animal kingdom. Darlington and Janaki-Ammal in 1945 and Stebbins in 950 estimated that polyploids make up 30 to 35% of Angiosperms. In certain families, very high [...]
In this article we will discuss about:- 1. Classification of Haploids 2. Origin of Haploids 3. Meiosis. Classification of Haploids: According to their cytological features, haploids have been classified into different types (Fig. 17.1), a brief description of which is given below. I. Euhaploid: The chromosome number of such a haploid is an exact multiple of one of the basic [...]