We do have chromosomes that recombinated ,but aren't there pure chromosomes that are not recombinated that people would have?


closed as unclear what you're asking by John, David, another 'Homo sapien', Bryan Krause, James Aug 21 '18 at 9:34

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As you say people, I will assume you are talking about humans only.

Except for the small pseudo-autosomal regions (PAR1, PAR2), the Y-chromosome and the X-chromosome do not recombine together. This means that if you are a girl, then you have inherited a X chromosome from your father who did not recombine in your father (but might have recombined in your father's mother if that's where this chromosome come from). If you are a boy, then you have inherited a Y chromosome from your father who never recombines.

There is also mitochondrial DNA (mtDNA) that does not recombine but mtDNA is not organized into chromosome.

  • $\begingroup$ what can cause a y chromosome and x chromosome to recombine? $\endgroup$ – Daniel Rigg Aug 10 '18 at 15:36
  • $\begingroup$ Y and X chromosome recombine at the pseudoautosomal regions. It seems that those regions exist to allow segregation of the two chromosomes during meiosis. $\endgroup$ – Remi.b Aug 10 '18 at 16:01
  • $\begingroup$ so why can't normal y chromosome recombine? $\endgroup$ – Daniel Rigg Aug 10 '18 at 16:02
  • $\begingroup$ Do you mean "why can't the non PAR part of the Y recombine?"? $\endgroup$ – Remi.b Aug 10 '18 at 16:03

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