Download to read the full article text. Normal male mammals have two copies of these genes: one in the pseudoautosomal region of their Y chromosome, the other in the corresponding portion of their X chromosome. Nature Education.
The stocks selected were such that they differed from each other significantly in respect of all the traits studied.
In fact the data showed that the contribution of the autosomes is more than that of the X-chromosome. The function of these pseudoautosomal regions is that they allow the X and Y chromosomes to pair and properly segregate during meiosis in males. Normal females also possess two copies of pseudoautosomal genes, as each of their two X chromosomes contains a pseudoautosomal region.
In Cross sex chromosome with autosome in Wigan, Steven L. The differentiation of the sex-chromosomes of Drosophila into genetically active and inert regions. Nature Education. Bhat, P.
The Principles of Clinical Cytogenetics. Genetics22—; — Help Community portal Recent changes Upload file. Robertson, F. Having three copies of an autosome known as a trisomy is far more compatible with life, however.
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A common example is Down syndrome , which is caused by possessing three copies of chromosome 21 instead of the usual two. Hidden categories: Commons category link is on Wikidata. The stocks selected were such that they differed from each other significantly in respect of all the traits studied.
Two-way selection for egg-production in Drosophila melanogaster. Reciprocal crosses were made between N-8 and b PAR2 is at the tips of the long arms, spanning kbp.