摘要
已知杂交组合2个亲本的基因型,可以预测杂交组合后代基因型的纯合程度或比例,这对于育种上提高选择的把握度和预测性具有意义。根据遗传图谱、2个亲本等位基因的差异和连锁遗传规律、自由组合规律,应用数学建模的方法,建立了具有各同源染色体上3对连锁基因的杂交组合后代基因型纯合程度的预测模型和数学期望。结果表明,杂种后代基因型的纯合程度和比例是可以遗传的,其中自交后代某一世代的基因纯合率模型为:G(t)=sum([g1(tk)+g2(tk)+g3(tk)+g4(tk)]) from k=1 to ∞ t,多对染色体3对连锁基因自交后代基因纯合效应为:G(t,n)=Πni=1sum([g1(tk)+g2(tk)+g3(tk)+g4(tk)]) from k=1 to t。依据模型编制计算机程序,并参照小麦遗传图谱模拟了小麦杂交组合后代基因型纯合程度的分布规律。其研究结果将为遗传育种提供理论支持和深远影响。
It is very significance for improving selective accuracy and predictability on breeding which geno- types of two parents cross combination can be predicted homozygous degree or frequency to two parent geno- types. According to genetic map, the difference of two parents allele, the rule of linkage heredity and the law of the free combination, built the prediction model and the mathematical expectation of homozygous of progeny genotype of cross combination which have three pairs of linkage gene in each homologous chromosome by ap- plying mathematical modeling method. The results show that ： homozygous degree or frequency of hybrid proge- ny genotype can be inherited. Gene homozygous model of a generation of selfing generations is G（t）=∑k=1^t[g1（tk）＋g2（tk）＋g3（tk）＇g4（tk）]genes homozygous effect of selfing generations which have three pairs k=1 of linkage gene in more chromosome is G（t,n）=Пi=1^n∑k=1^t[g1（tk）＋g2（tk）＋g3（tk）＋g4（tk）] Based on the model compiled computer program, simulate distribution regularities of homozygous degree of progeny genotype for cross combination by genetic map in wheat. The results were provided theoretical support in genetic breeding.
出处
《种子》
CSCD
北大核心
2013年第6期31-35,共5页
Seed
关键词
连锁基因
自交后代
基因纯合效应
概率
linkage gene
selfing generations
genes homozygous effect
probability
