He argued that organisms evolve gradually by accumulating small hereditary changes.

他论证说,生物是由于一些小的遗传变异的积累而逐渐演变的.

辞典例句

Seed formation, ( NOT: seed dispersal ) increases the chances of genetic variations.

种子形成 ( 不是: 散播种子 ) 使遗传变异的机会增加.

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Figure 2. UPGMA dendrogram based on ISSR bands of three Cinnamomum species.

图二, 三种肉桂ISSR遗传变异分析之归群分析(UPGMA)树状图.

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Objective To study the genetic variation and inbreeding of Xishuangbanna miniature pig.

目的分析版纳小耳猪近交系种群的遗传变异及近交程度.

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Phenotypic variation coefficients were all greater than the genetic variation coefficients.

表型变异系数均大于遗传变异系数.

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Self delivers a department there existing higher hereditary variation in.

自交系间存在较高的遗传变异.

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In short , a supply of genetic variation is all that's necessary for evolution to continue.

简而言之, 遗传变异是进化不断向前的必要动力.

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However, substantial genetic variation existed among cows and bulls in breeding values for milk yield.

然而对于产奶量而言, 母牛和公牛的育种值都存在较高的遗传变异.

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Gametophytic self - incompatibility ( GSI ) is a widespread mechanism in flowering plants , which prevents self - fertilization and promotes outcrossing.

自交不亲和是被子植物预防近亲繁殖和保持 遗传 变异的一种重要机制.

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Molecular Ecological Studies on Genetic Vriation and Salt － Resistant Characteristics of several Species of Mangroves.

几种红树植物的遗传变异和抗盐特性的分子生态学研究.

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This promotes genetic varation in the population especially in plants that are DIOECIOUS and MONECLOUS.

可以在种群中产生遗传变异,特别是在一些雌雄异体或雌雄同体的植物中.

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This ability decreases the negative effects of drift and inbreeding on genetic diversity in small populations.

这主要是由于其有很强的萌蘖繁殖能力,这种无性繁殖方式降低了小种群中遗传漂变和近交对遗传多样性的影响,使七子花的遗传变异得到维持.

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Each group carried only a subset of the genetic variation from its ancestral population.

每个族群只携带有他们祖先群体中遗传变异的一部分.

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The genetic variation between Fengweisang and its sports analyzed at the molecular lever by ISSR primers.

利用ISSR引物,从分子水平分析了凤尾桑及其芽变株系的遗传变异.

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