The Character of Diploid Variation Chromosome Set of Animal Species Bos Taurus, Bos Grinniens, Ovis Aries and Equus Caballus

Quantity of chromosomes in metaphase cell of farm animal is accidental discrete quantity because it will give them fixed value which is usually expressed in the whole numeral. Distribution of this character has a specific feature -excessive accumulation of frequencies in the central class of variational series.The authors analysed the laws of distribution of the number chromosomes in cattle yak, sheep and horses with normal chromosomes and it was found that the distribution of the chromosome number (2n) in the studied animals follows to the type of excessive regularities distribution. –

Key words: Diploid set, metaphase cell, karyotype, farm animal, excessive type of distribution.