SOMATOPLASTIC STERILITY AS A CAUSE OF SEED FAILURE AFTER INTERSPECIFIC HYBRIDIZATION

Somatoplastic Sterility as a Cause of Seed Failure after Interspecific Hybridization.

OLLAPSE of the immature seed is a frequent cause of sterility folc lowing interspecific matings in flowering plants. The histological changes leading to failure of fertile ovules of this kind are described in the present paper. Two tissues are primarily involved, endosperm and nucellus. The evidence shows that abortion of the young seed originates in an impaired capacity for growth of the endos...

Excessive Attenuation of Measles Virus as a Possible Cause of Failure in Measles Immunization

Gene transposition as a cause of hybrid sterility in Drosophila.

We describe reproductive isolation caused by a gene transposition. In certain Drosophila melanogaster-D. simulans hybrids, hybrid male sterility is caused by the lack of a single-copy gene essential for male fertility, JYAlpha. This gene is located on the fourth chromosome of D. melanogaster but on the third chromosome of D. simulans. Genomic and molecular analyses show that JYAlpha transposed ...

The Role of Cremaster Muscle as a Cause of Ascending Testis after Inguinal Hernia/Hydrocele Repair

Background Ascending testis (AT) is one of the rare but serious complication that may occurs following inguinal hernia/hydrocele repair. We aimed to review our more than 7 years’ experience and discuss the possible mechanism through which the AT possibly occurs following inguinal hernia/hydrocele repair. Materials and Methods A retrospective analysis of 7,212 boys who had undergone inguinal her...

Drosophila Females Undergo Genome Expansion after Interspecific Hybridization.

Genome size (or C-value) can present a wide range of values among eukaryotes. This variation has been attributed to differences in the amplification and deletion of different noncoding repetitive sequences, particularly transposable elements (TEs). TEs can be activated under different stress conditions such as interspecific hybridization events, as described for several species of animals and p...