Developments in the meiotic analysis of hybrids. V. Second-order models for tetraploids and pentaploids
Developments in the meiotic analysis of hybrids. V. Second-order models for tetraploids and pentaploids
复制标题
杂种减数分裂分析的进展。
作者：
C. Chapman;G. Kimber
‘Second-order’models for meiotic analysis have been developed for tetraploid and pentaploid hybrids to address a number of situations intermediate between the established ‘first-order’models. They all incorporate a third parameter of relative affinity, z, intermediate between x and y, the relative affinities of the most and least closely related genomes respectively. Four such models are described: a 2:(1: 1) and a (2: 1): 1 for tetraploid hybrids; and a 2:(1: 1): 1 and a (2: 1): 1: 1 for pentaploid hybrids. Examples of their application are given. Where z≈ x, or z≈ y, then interpretation through the simpler first-order models is appropriate. In other cases application of second-order models can reveal more subtle relationships among the genomes in a hybrid.
