单语范例（未经PONS编辑处理）
英语
- Segment polarity genes are expressed in the embryo following expression of the gap genes and pair-rule genes.en.wikipedia.org
- The gap genes are directly influenced by the maternal genes and are expressed in local and overlapping regions along the anterior/posterior axis.en.wikipedia.org
- The same gap gene can act positively in one stripe but negatively in another.en.wikipedia.org
- This gradient then defines the expression pattern for gap genes, which set up the boundaries between the different segments.en.wikipedia.org
- Each gap gene, therefore, is necessary for the development of a section of the organism.en.wikipedia.org
- Gap genes are defined by the effect of a mutation in that gene, which causes the loss of contiguous body segments, resembling a gap in the normal body plan.en.wikipedia.org
- These genes are influenced by not only the maternal genes, but also by epistatic interactions between the other gap genes.en.wikipedia.org
- The gap genes work to activate the pair-rule genes.en.wikipedia.org
- Each pair-rule gene is expressed in seven stripes as a result of the combined effect of the gap genes and interactions between the other pair-rule genes.en.wikipedia.org
- The homeotic genes are activated by gap genes and pair-rule genes.en.wikipedia.org
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英语