Further studies on the effect of temperature on crossing over

The effect of temperature on chiasma frequency

“…Plough's (1917) graph of his results showed two maxima at i °and 31°, but this was a mistake, a has been pointed out by Smith (1936). In genetical work with other organisms some results similarly show a temperature at which cross-over frequencies are minimal (e g. the fungus Ustilago hordei (Huttig, 1931)), while in other experiments no minimum value was observed over the temperature range studied (e.g.…”

“…The insects were placed in the temperature chambers 24-72 hours after their last ecdysis, and they remained there three or four days. In all three organisms, at the lowest temperature chiasma frequency was less than at the next higher temperature ; thus White's graphs resemble Plough's (1917). The number of cells scored for each temperature was very small, and we are not told how many animals were used.…”

“…IN the well-known effect of temperature on crossing-over in Drosophila, recombination between loci close to the centromere has a minimum value at 22° C. (Plough, 1917(Plough, , 1921Stern, 1926;Graubard, 1934). Plough's (1917) graph of his results showed two maxima at i °and 31°, but this was a mistake, a has been pointed out by Smith (1936).…”

Fluctuating asymmetry: a biological monitor of environmental and genomic stress

“…Within the first decade of genetic experiments with Drosophila melanogaster, it became established that recombination increases when the temperature at which flies develop is increased or decreased from 25°C, the normal culture temperature, with major increases close to lethality around 13 and 30°C (Plough, 1917). This means that at both high and low temperatures there is a sharp escalation of recombination close to the environmental conditions at which species continuity is threatened.…”

A balanced four-point linkage experiment for linkage group XIII of the house mouse

“…Temperature (Plough, 1917), age (Bridges, igi), X-rays (Muller, 1925), and heterozygous inversions (Schultz and Redfield, 1951) have been shown to produce a variation in recombination near the centromere but very little elsewhere.…”