Sterility in Hybrids

Sterility in Wheat Hybrids. I. Sterility Relationships and Endosperm Development.

Partial or complete sterility is of frequent occurrence in species crosses. Within the same genus certain species are sterile when crossed while ather combinations are completely fertile. Partial sterility may cause the elimination of certain classes of gametes and prevent desired recombinations of characters in the second generation. Sterility may also cause an abnormal vegetative development....

Studies on Hybrid Sterility. II. Localization of Sterility Factors in Drosophila Pseudoobscura Hybrids.

HE causation of hybrid sterility has long been one of the unsolved T problems of biology. To date, probably the greatest advance in this field has been made by FEDERLEY who discovered a failure of the meiotic chromosome pairing in the sterile hybrids between moths of the genus Pygaera. This finding has since been amply corroborated by other investigators in sterile hybrids both in animals and i...

Sterility in Wild Roses and in Some Species Hybrids.

Variation in pollen sterility in the same individual in one season.. . . . . . . . . . . . . . . . . . . . . . Variation in pollen sterility in the sa Ovule sterility.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GENERAL DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONCLUSION. . ...

A Study of Partial Sterility in Certain Hybrids.

INTRODUCTION. ........ .............................. ......................... 311 The types used.. ................................................................. 311 The work of the early hybridizers Experimental work.. ............ .............................. The parental strains and their beha;ior ............................ Nicotiana rustica humililis crossed with Nicotiana panicula...

On the Sterility of the Interracial Hybrids in Drosophila Pseudoobscura.