Hybrid dysgenesis in Drosophila

(a) Male Drosophila of the P cytotype crossed to females of the M cytotype produce F1 progeny
that are largely infertile due to mutations resulting from P element transposition. (b) Crosses of P-cytotype females to males with either the
P or the M cytotype yield F1 progeny of normal fertility
(a) Male Drosophila of the P cytotype crossed to females of the M cytotype produce F1 progeny
that are largely infertile due to mutations resulting from P element transposition. (b) Crosses of P-cytotype females to males with either the
P or the M cytotype yield F1 progeny of normal fertility


(a) (b) P Cyto’type M Cyto’type M CY’EOtyPe P Cyto’type (chromosomes (chromosomes (chromosomes (chromosomes carry P-elements) lack P—elements lack P-elements) possess P-elements and tra nsposition- and transposition- repressing protein) repressing protein) Pa re nta l generation F1 hybrids Sterile wild type Normal fertility l l lFew or no progeny, due F2 progeny I lto F sterility caused by . Ihybrid dysgenesis ) / 3.», (\ Wild-tvoe offspring