果蠅微小染色體的進化
Date Issued
1999
Date
1999
Author(s)
張慧羽
DOI
882313B002006
Abstract
In Drosophila, the microchromosomes
have essential genetic function in spite of
their small size. Inter- or intraspecific
variation in length of microchromosomes
was discovered in many Drosophila species.
The difference was contributed to different
amount of heterochromatin, and it might also
be due to a translocation with Y chromosome.
A previous report of ours indicated when an
Indian D. nasuta male crossed with a
Okinawa D. albomicans female, a tendency
of reaching fixation to the albomicans type of
microchromosome was observed in the
hybrid offspring. Since the microchromosome
of D. albomicans is larger,
there may exist selective advantage.
Therefore, we make interspecific crosses in
order to find out whether this tendency holds.
Taking the characteristics of interspecific
difference in length of microchromosomes
between D. albomicans and D. nasuta,
hybrid populations were established by
crosses between different geographical
stocks of these two Drosophila species.
Those hybrid populations have been reared
by non-overlapping generation method. The
result of the karyotype assay suggests no
obvious selective advantage of the
albomicans type microchromosome.
Subjects
Drosophila albomicans
D.
nasuta
nasuta
inter-specific difference
microchromosomes
Publisher
臺北市：國立臺灣大學植物病理與微生物學系暨研究所
Type
other
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