Induction of mosaic eggs in the silkworm (Bombyx mori) by means of high temperature shock
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概要
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By applying high temperature shock (40-41°C, one hour) to eggs of the silkworm moth immediately after being laid, the present author has obtained many mosaic eggs in respect to their coloration. In this experiment recessive red (egg color, r/r) and their normal allele (+/+) were used as markings. A crossing was made between the normal females and red males; and the eggs produced were exposed to high temperature immediately after being laid (aged 0-1 hour), namely at about the time of maturation division of the egg.As the mother is homozygous for the dominant gene the resulting F1's are expected to be normal. In fact, the control batches which were unexposed showed normal color without exception, while exposed batches gave, besides normal eggs, many dead eggs which were unpigmented and some recessive red and mosaic eggs. Egg mosaics are divided into two categories: One is mosaics of serosa cells of dominant and recessive colors; and the other is incomplete formation of serosa cells, which is often seen in the eggs developed parthenogenetically. The term "mosaics" is applied here not to the latter but only to the former.The red eggs and mosaics thus obtained proceeded development, but most of them died before hatching. Thus a very few caterpillers hatched out (four from the red and two from the mosaics), while three of them (one from the red and two from the mosaics) completed their life cycle.If the characteristics of these caterpillers are referred to those their parents possessed, namely, mother [+r/+r, PsY/Py, +os] father [r/r, (Py/Py, Py/py, py/py), (os/os, os/+)] it may be known that they are too patroclinous to be expected as resultants of normal fertilization. In the case of red eggs, it may be explained by assuming as a resultant of dispermic merogony (formation of an individual by the union of two sperm nuclei in the ooplasm independently to egg nucleus) as has already been demonstrated by Hasimoto (1934) in the silkworm.The mechanism of mosaic formation in this case is presumably explained by a slight modification of Morgan's hypothesis (1905) of dispermy in honey bees, i. e., three spermatozoa having entered, one fuses with egg nucleus and its products produce the normal part of the egg; and the remaining two fuse each other and give rise to the red part. If the invagination of the mosaic egg takes place in border regions of normal and red cells the resulting caterpillers may be mosaic.
- 日本遺伝学会の論文
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- Induction of mosaic eggs in the silkworm (Bombyx mori) by means of high temperature shock
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