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persist. Fruit flies, on the other hand, models of speciation, genetic
persist. Fruit flies, on the other hand, models of speciation, genetic

... homozygous may be one advantage of inbreeding. None of the three reciprocal translocations documented by Hou et al. [1] looks obviously beneficial, although one of them separates two genes from their promoter regions, which might alter their expression. The next step towards speciation would be the ...
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... rare morphologically normal escapers, however, could be distinguished from wild type, since all mutant males invariably died within a few days. Complementation analysis of the jnR4 group was complicated by the fact that homozygous and heteroallelic females had a less extreme phenotype; nevertheless, ...
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X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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