The variation of tetraploid is caused by the variation of the quantity and structure of chromosome and gene mutation,recombination as well as by the variation of coordinating relationship between karyon and cytoplasm and that between zygote embryo and endosperm.Its variation rate is expected to be higher than diploid.Homozygous tetraploid is a relatively balanced system,the continued selection is invalid.Phenotype variations of tetraploid in different species are different,both the advantage variations and ...
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