THE EFFECT OF MATERNAL AGE AND RADIATION ON THE RATE OF NON-DISJUNCTION IN DROSOPHILA MELANOGASTER

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Abstract
Virgin females were aged from one to 29 days before exposure to 1650r of gamma radiation. Yellow body (y) was used as the non-disjunction marker on the X chromosome. There was a seven-fold increase in the frequency of exceptional flies among the progeny of irradiated females compared with the controls. There is no evidence of an increased rate of non-disjunction with aging in the absence of radiation. In the irradiated series there is a positive correlation between the rate of non-disjunction and maternal age.

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