Somatic Pairing and Meiotic Nonrandom Disjunction in a Pericentric Inversion of Hylemya Antiqua (Meigen)

Overview

Journal Chromosoma

Specialty Molecular Biology

Date 1977 Feb 3

PMID 837801

Citations 7

Authors

C van Heemert

Affiliations

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Abstract

An asymmetrical pericentric inversion in the onion fly, Hylemya antiqua was studied. Somatic pairing was studied in young eggs from test-and sibcrossed inversion heterozygous females which gave four and seven distinguishable karyotypes respectively. From these seven, three are balanced: the normal type, the inversion heterozygote and homozygote, and four are unbalanced recombinant karyotypes descending from crossovers in the loop. In all types at all mitotic stages the centromeres are paired. The telomeres only show association during prophase but this decreases from mid to late prophase. Quantitative analysis of the four different crossover products as produced by inversion heterozygous females showed the presence of nonrandom disjunction. A significant disparity was observed, viz. the normal chromosome was taken up preferentially into the functional gamete compared to the inverted chromosome. Dragging of long chromatids in the asymmetric dyad during M I-A I is a possible explanation of this feature.

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