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

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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.

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  • $\begingroup$ 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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