Autosomes are all the chromosomes with the exception of sex chromosomes. While Y chromosomes occur in each generation only in the bodies of males and X chromosomes spend twice as much time in the bodies of females than in the bodies of males (because there are two copies in each cell), autosomes occur with the same frequency in males and females.

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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more