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The genetic determinism of hemp sex. Cannabis sativa L. has a very complex genetic constitution and heredity which explains the dioecy, amplitude of phenotype variability, polymorphism and the great biological plasticity of this species.
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The flexibility of Cannabis sativa L. sexual phenotype often leads to the differentiation of hermaphrodite flowers or bisexual inflorescences (monoecious phenotype).
Therefore, the genetical component of sex determination and of sex control displays, by phenotype expression, a great variability in hemp. In the plant kingdom, the dioecy is relatively uncommon, and a very low percentage of dioecious plant species have the XY system well determined. In the cases where the XY system was found, the authors sustain that it have evolved recently and independently.
In plants, the structure, the origin and the role of heterosomes in sex determination are poorly understood, despite the number of studies on sex determination in haploid, diploid, and triploid plants consider that sex specificity has evolved in 75% of plant families by male sterile or female sterile mutations, but well-defined heteromorphic sex chromosomes are known in only four plant families. It is possible that an essential event in sex chromosome evolution
However, once the respective recombination is suppressed, an incipient Y chromosome starts to differentiate by accumulating deleterious mutations, transposable element insertions, chromosomal rearrangements, and selection for male-specific alleles.