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Insect development. VIII. Maturation and early development of unfertilized grasshopper eggs

✍ Scribed by Robert L. King; Eleanor H. Slifer

Publisher
John Wiley and Sons
Year
1934
Tongue
English
Weight
886 KB
Volume
56
Category
Article
ISSN
0362-2525

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✦ Synopsis

Abstract

Maturation and early cleavage in unfertilized Melanoplus differentialis eggs have been followed with material secured immediately before as well as after oviposition, and (1) fixed at once, or (2) held in an incubator at 25Β°C. and, subsequently, fixed at selected intervals. Eggs ready to be laid were all found in the metaphase of the first maturation division. The second polar body is given off (at 25Β°C.) within 5 to 7 hours after laying. Meiosis appears to be unaffected by the absence of the sperm nucleus and proceeds at the same rate as in fertilized eggs. No morphological differences could be found between the process here and in eggs from mated females.

During early cleavage, or later, the diploid number of chromosomes may be restored in some (or perhaps all) cells of the embryo.

Development begins in the greater number of these unfertilized eggs but is successfully completed in only a very few.

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Insect development. VII. Early stages in
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✍ Eleanor H. Slifer; Robert L. King πŸ“‚ Article πŸ“… 1934 πŸ› John Wiley and Sons 🌐 English βš– 400 KB πŸ‘ 1 views

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