Definition of non-crossover in US English:

non-crossover

noun

Genetics
  • A chromosome that has not undergone crossing over during meiosis; a gamete that has one or more such chromosomes; (also) an individual who does not exhibit the phenotypic results of crossing over (at one or more loci).

Origin

Early 20th century; earliest use found in American Naturalist. From non- + cross-over.

Pronunciation

non-crossover

/nɒnˈkrɒsəʊvə/