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What are the theories explaining heterosis? What are the main arguments?

发布时间：2025-07-06 17:56:31

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答案：【计分规则】: The theories explaining heterosis mainly include dominant hypothesis and overdominant hypothesis. The main arguments are:The dominant hypothesis believes that each gene can produce a full dominant or partial dominant effect, and the dominant gene is beneficial to growth, and the recessive gene is harmful. The heterosis is derived from the dominant effect between alleles and between non-alleles. The cumulative effect of these dominant effects. Crossing makes certain dominant dominant genes of the female parent obscure the unfavorable recessive genes of the allelic male parent, and other dominant favorable genes of the male parent also obscure the unfavorable genes of the allelic male parent. The crossover makes the dominant position of the hybrid More than any parent shows heterosis.overdominant hypothesisHeterosis is the result of interaction between alleles caused by heterogeneous binding of parental genotypes. There is no explicit recessive relationship between alleles. Heterozygous allele interaction is greater than the effect of homozygous alleles. There is interaction between non-alleles.

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