ISSN:
1432-0886
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract The chromosome complement of hybrid males from the cross between Drosophila miranda female and D. persimilis male provides an interesting chromosomal situation where an autosome, the 3rd chromosome of D. persimilis, coexists with a homologue that developed into a sex chromosome, the X2 in D. miranda. Except for certain inversions and a few minor translocations, these two chromosomes (X2 and the 3rd) still look alike as polytene elements. However, in hybrid males pairing of the two chromosomes, the X2 and 3rd, is rare, while in female hybrids it occurs frequently. — 3H-TdR labeling shows that while the X2 and 3rd chromosomes replicate synchronously in hybrid female, in the hybrid male the former completes its replication earlier than the 3rd chromosome, as do the two arms of the X1 (XL and XR). The frequency and relative intensity of 3H-TdR labeling of each site of the X2 and that of the 3rd chromosome in hybrid males closely agree with those of the corresponding sites in the X2 of the miranda male and the 3rd chromosome of the persimilis male (or female), respectively. The results suggest that timing and rate of replication of the X2 are determined autonomously and follow the pattern in the respective parental species.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00302351
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