idiochromosome
Example Sentences
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In the somatic cells of the former class he finds in the male the unequal pair, in the female an equal pair, the smaller chromosome being replaced by an equivalent of the larger "idiochromosome."
From Studies in Spermatogenesis Part II by Stevens, Nettie Maria
Wilson called it the 'X chromosome,' McCluny the 'accessory chromosome,' Montgomery the 'hetero-chromosome,' while the names 'heterotropic chromosome' and idiochromosome have also been used.
From Hormones and Heredity by Cunningham, J. T.