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The definition of a pure line is a result of inbreeding where animals or plants have certain characteristics that are the same through generations. An example of a pure line is the result of inbreeding of a certain flower to help it fight off diseases.
They differ from each other
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well i only know that a male has 23 chromosomes and his hormones are called testosterone ,please follow me and his sex chromosome is <em><u>xy</u></em>
