Ploidy - is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Somatic cells, tissues and individuals can be described according to the number of sets present (the ploidy level): monoploid (1 set), diploid (2 sets), triploid (3 sets), tetraploid (4 sets), pentaploid (5 sets), hexaploid (6 sets), heptaploid or septaploid (7 sets), etc. The generic term polyploid is used to describe cells with three or more chromosome sets. Half of all known plant genera contain polyploid species, and about two third of all grasses are polyploid. In mammals and birds, ploidy changes are typically is, however, evidence of polyploidy in organisms now considered to be diploid suggesting that polyploidy has contributed to evolutionary diversification in plants and animals through successive rounds of polyploidization and rediploidization. #Tetraploid #polyploid #Genetics #diploidGamets #genotype #phenotype
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