Gert Bonnier

RATE OF DEVELOPMENT OF VIABILITY MUTANTS IN DROSOPHILA MELANOGASTER

In connection with investigations on populations of Drosophila several studies have been made on rate of development. As a rule females are allowed to oviposit for about 24 hours or more whereupon the emerging adults are .counted daily or every 2 days (see for example Dobzhansky, Holtz and Spassky, 1942). In this way the time from egglaying to eclosion will be known with a margin of at least 48 hours. Studies with closer margins are, on the contrary, sparse. Bonnier (1926) made an experiment in which egglaying was confined to 2 hours. Check was then made on pupation in 2 hour intervals, and of emergence of females and males also in 2 hour intervals. Dobzhansky (1930) studied th.e t~me of development of progeny of triploid females. In this case egglaying was also restricted to 2-hour-periods and the bottles in which the flies developed were examined every 2 hours. The present investigation was started with the aim of studying possible relations between the rate of development in x-ray induced subvitals and the degree of their subvitality as measured by their survival rates. Together with this a comparative inquiry is made into the variance of the rate of development in homoand heterozygotes.

Secondary influences from X-ray irradiation on mutational processes in Drosophila melanogaster

Secondary influences from X-ray irradiation on mutational processes in Drosophila melanogaster