Abstract
WITH the view of synthesising a double recessive black-vestigial stock of Drosophila melanogaster, Dr. G. Eloff1 made a cross of black and vestigial, both of which are contained in the second chromosome. The F2 generation, to his surprise, contained many b vg flies. To solve the question, the F1 males were mated with double recessive females (b vg), when an independent segregation of black and vestigial was found. He applied the fact to the F2 data to calculate the crossing-over value between b and vg in the female, and estimated it to be 17.8 per cent. The value is close to the standard value of 17.0 per cent (18.5 per cent, according to the recent census). For his 50 per cent crossing-over in the male, he writes: ” Some other explanation (for example, of chromosomal mutation) must be offered”.
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G. Eloff, NATURE, 137, 151 (1936).
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MORIWAKI, D. A Case of 50 per cent Crossing-over in the Male Drosophila. Nature 138, 34 (1936). https://doi.org/10.1038/138034a0
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DOI: https://doi.org/10.1038/138034a0
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