Article from Heredity, the genetics society, Volume 102 Number 3 March 2009After scientists published the genetic map of the strawberry, Fragaria virginiana they discovered that in the evolution of sex chromosomes there may be two different loci or alleles that seperatly control the male and female function.
Majority of flowering plants are hermaphrodites, which have both male and female reproductive organs but some species have evolved seperate sexes as in the case of F. virginiana. This species is at the early stage of of sex chromosome evolution. Sex chromosomes are believed to have evolved from ‘ordinary’ autosomal chromosomes but the mechanisms of the evolution are still unclear. This study further developes the idea that the evolution of sex chromosomes is controlled by two sex determining loci, which are joined by a close linkage group so they are inherited jointly. The two loci explanation of sex chromosome evolution is further promoted by the presence of sterile plants (neuters) and many other studies such as the Ming and Moore, 2007 that describes genomic features which reflect evolutionary histroy.The article also suggests futher research in connection with the findings of the Ming and Moore, 2007 findings to confirm the two loci controll the evolution of sex chromosomes, by finding features such as gegeneration of genes, accumulation of repetitive elements and low gene density.
In conclusion, this study provides further evidence for the hypothese that sex chromosome evolution from autosomes are controlled by two seperate loci that are part of a linkage group.
Majority of flowering plants are hermaphrodites, which have both male and female reproductive organs but some species have evolved seperate sexes as in the case of F. virginiana. This species is at the early stage of of sex chromosome evolution. Sex chromosomes are believed to have evolved from ‘ordinary’ autosomal chromosomes but the mechanisms of the evolution are still unclear. This study further developes the idea that the evolution of sex chromosomes is controlled by two sex determining loci, which are joined by a close linkage group so they are inherited jointly. The two loci explanation of sex chromosome evolution is further promoted by the presence of sterile plants (neuters) and many other studies such as the Ming and Moore, 2007 that describes genomic features which reflect evolutionary histroy.The article also suggests futher research in connection with the findings of the Ming and Moore, 2007 findings to confirm the two loci controll the evolution of sex chromosomes, by finding features such as gegeneration of genes, accumulation of repetitive elements and low gene density.
In conclusion, this study provides further evidence for the hypothese that sex chromosome evolution from autosomes are controlled by two seperate loci that are part of a linkage group.
Article found online at:
http://www.nature.com/hdy/journal/v102/n3/full/hdy2008115a.html
Ming and Moore, 2007
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VS4-4N276H6-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=107153948979e4ff6e57ff2332ab65b1
Samantha Pollock
42060817
http://www.nature.com/hdy/journal/v102/n3/full/hdy2008115a.html
Ming and Moore, 2007
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VS4-4N276H6-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=107153948979e4ff6e57ff2332ab65b1
Samantha Pollock
42060817
