Genetics Department, Iowa State University, Ames, Iowa 50011.
Genetics. 1984 May;107(1):117-30. doi: 10.1093/genetics/107.1.117.
The percentage of crossovers is consistently higher in plants hypoploid for six B-A translocations when crossed as males than when crossed as females; in most instances, this excess of male crossing over exceeds that found in control crosses (involving normal chromosomes). Thus, there seems to be something about the hypoploid condition that is responsible for the higher percentage of male crossovers. Several explanations for this "hypoploid effect" are possible, but none has been demonstrated to be responsible for the phenomenon.
当植物作为雄性进行杂交时,与作为雌性进行杂交相比,在六个 B-A 易位的情况下,易位杂合体的交叉率始终更高;在大多数情况下,这种雄性交叉的过剩超过了在对照杂交中发现的(涉及正常染色体)。因此,似乎是超数染色体条件导致了更高比例的雄性交叉。对于这种“超数效应”有几种可能的解释,但没有一种被证明是导致这种现象的原因。