|
Vol. 43 No. 3, 2004
Sex Ratio Distortion in Hybrids of Drosophila albomicans and D. nasuta
Yung-Yu
Yang1, Fei-Jann Lin2 and Hwei-yu Chang1,2,*
1Department
of Entomology, National Taiwan University, Taipei, Taiwan 106
2Institute of Zoology, Academia Sinica, Nankang,
Taipei, Taiwan 115
Yung-Yu
Yang, Fei-Jann Lin and Hwei-yu Chang (2004) A sex-ratio
distorter in Drosophila albomicans
was uncovered by the hybridization between Japanese Okinawa D. albomicans females and Indian D. nasuta males. The F1 male from
this cross produces female-biased offspring. The genic nature
demonstrated in the present study suggests that meiotic drive instead
of non-disjunction of the sex chromosomes during meiosis is the major
cause for this. The meiotic driver was found to be located on the neo-X
chromosome of D. albomicans,
whose genome also contains drive suppressors, while that of D. nasuta is suppressor-free. In
addition, hybrid F1 and F2 males were found to be
semisterile probably due to an interaction between the 3rd and Y
chromosomes of D. nasuta and
the autosomes of D. albomicans.
Key words: Drosophila
albomicans, D. nasuta,
Meiotic drive, Sex-ratio distortion.
*Correspondence: E-mail: hwei@gate.sinica.edu.tw
|
