Open AccessGenetics of inbred Drosophila melanogaster VII. Evidence of normal chromosome pairing in the distal ends of X‐chromosomes in secondary non‐disjunction
Author(s) -
LÜNING K. G.
Publication year - 1982
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1982.tb00860.x
Subject(s) - biology , genetics , recombination , drosophila melanogaster , meiosis , pairing , chromosome , inbred strain , hybrid , chromosome pairing , x chromosome , gene , botany , physics , superconductivity , quantum mechanics
In tests of secondary non‐disjunction in hybrids from two inbred lines (+ w + + H– K/y w a ex vf – 2IB S Yy + ) the majority of exceptional females are phenotypically w/w a . 1252 such females were tested individually to reveal whether recombination had occurred or not. 30 of these females were recombinants, and 13 of them had recombined in the y‐w region. A subdivision based on the brooding scheme indicated that in the 1–5th day broods the frequency of recombination in the y‐w region was 0.49 % and in the 11–14th day broods 2.09 %. (The corresponding frequencies from XX mothers of the same inter‐strain cross were 0.88 and 2.59 %, respectively.) It is concluded that these results are in accordance with a former analysis of phenotypic deviants among exceptionals, thereby indicating that recombination at the most distal end of the X‐chromosome is very similar in XXY and XX females. The results also suggest near normal pairing in the most distal end of the X‐chromosomes of XXY females prior to non‐disjunction.