有性生殖的

These species time their sexual reproduction with periods of environmental uncertainty, and reproduce asexually when conditions are more favourable.

这些物种按环境不确定的时期安排它们有性生殖的时间，当条件较为有利时它们进行无性繁殖。

If sharks in the wild are reproducing asexually, their young will be genetically weaker than those produced sexually.

如果野生鲨鱼也用无性生殖的方式繁衍后代，那么他们的后代与有性生殖的后代相比更为脆弱。

Male gametogenesis is one of the key steps in plant sexual reproduction and is essential for the alternation between the diploid sporophytic phase and haploid gametophytic phase in the life cycle of higher plants.

植物雄配子体发生和发育是有性生殖的关键步骤之一，是高等植物通过有性生殖进行世代交替所必需的。

Outcrossing, the second fundamental aspect of sex, is maintained by the advantage of masking mutations and the disadvantage of inbreeding which allows expression of recessive mutations (commonly observed as inbreeding depression).

有性生殖的第二个基本方面是异型杂交。异型杂交是通过掩蔽突变优势和近亲繁殖劣势来维持的。近亲繁殖允许隐性突变的表达。这与查尔斯·达尔文相一致。

The daughter cells contain half no.of chromosome of the parent cell.Therefore it is also called reduction division.

减数分裂是在进行有性生殖的生物中导致生殖母细胞中染色体数目减半的分裂过程。

The potential of sexual reproduction in the three species was still very great.

可见三种橐吾有性生殖的潜力依然很大。

IN ALL species that practise sexual reproduction, males and females show gender-specific behaviours.

在所有有性生殖的物种中，雄性和雌性表现出各自性别特异的行为。

Scientists currently have developed several competing hypotheses to explain the evolution of sexual reproduction.

目前，科学家们已形成了几种相互竞争的假说来解释有性生殖的进化。

Alternatively,有性生殖 may allow for the ' ratcheting ' of evolutionary speed as one clade competes with another for a limited resource .

或者，有性生殖可能象'棘轮'那样控制了进化发展的速度，因为一个进化枝会和另一个竞争有限的资源。

Under natural conditions, the clonal growing rhizomes of L.

因此，三种橐吾有性生殖的潜力依然很大。

This paper demonstrated the impact on the environment today, an important factor is Education.

本文主要展示了当今影响环境的一个重要因素——教育。

Article 16 The power to interpret these Procedures shall remain with the Ministry of Agriculture and CAA.

第十六条本程序由农业部、国家认证认可监督管理委员会负责解释。