摘要:

Tetraploid cells of D.melanogastergrown in culture (line Ca.) characterized by one or more Y chromosomes (of different length), make it possible to describe the behaviour of these heterochromatic elements during prophasic synapsis. In this stage the Y chromosomes (as well as the other heterochromatic portions of the complement) are clearly allocyclic with respect to euchromatin, since they do not show a real synapsis. Nevertheless, a more specific attraction within the Y's exists, since all these elements show a tendency to form a group apart.

ISSN:0008-7114    

DOI:10.1080/00087114.1977.10796696

出版商:Taylor & Francis    

年代:1977

数据来源: Taylor

摘要:

Iris pallidaLam. is widespread in Tuscany where it is mostly cultivated for commercial purposes. Most of the plants observed are male-sterile. Particular attention was given to the Irises cultivated in Caspri (Castelfranco di Sopra—Arezzo) where malesterile and male-fertile plants, as well as a third type called « dentaroli », all grow together. According to the local farmers, « dentaroli » are characterized by lack of flowers. Plants, mostly of the male-sterile type, from areas other than Caspri were examined.

ISSN:0008-7114    

DOI:10.1080/00087114.1977.10796697

出版商:Taylor & Francis    

年代:1977

数据来源: Taylor