pure line

noun Genetics.
a uniform strain of organisms that is relatively pure genetically because of continued inbreeding and artificial selection.

Origin:
1905–10

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World English Dictionary
pure line
 
n
a breed or strain of animals or plants in which certain characters appear in successive generations as a result of inbreeding or self-fertilization

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Hybrids were also more responsive to changes in environment and were more stable than pure line entries.
These dogs are pretty similar, as you'd expect when crossing one pure line with another.
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