The origins and characteristics are described, with linkage data, of eleven mutant characters, namely, incomplete (ic), crumpled (cr), Interrupted (Ir), crooked (ck), ski (sk), balloon (ba), white (w), Plexate (Pt), retracted (rt), lethal-I (l-I), and lethal-2 (l-2), which were newly discovered inDrosophila ananassae.
Interrupted, crooked, white, and lethal-I are sex-linked, with their loci in the X-chromosome. Interrupted is dominant, though incomplete in its expression, the flies being sterile when they are homozygous. Lethal-I is a recessive gene that affects partially, killing many flies with the gene homozygously.
Genes ski, Plexate, retracted, and lethal-2, belong to the second chromosome. Plexate is dominant, the homozygous flies not being viable.
Balloon, so far as known at present, is only a mutant gene in the third chromosome.
Two mutant genes, incomplete and crumpled, are believed to be autosomal recessives; their linkage relations however have not been established owing to accidental loss of materials.
The chromosomes are of four V-shaped pairs, corresponding toMetz' L-type. No mutant gene of the fourth chromosome has so far been found.
KeywordsMutant Gene Linkage Data Recessive Gene Autosomal Recessive Linkage Relation
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