heterogeny

Based on the traditional introduction to meiosis process in teaching,it\'s proposed that the extension of meiosis teaching should be made from such aspects as digenesis,the formation of gametes,the relations with the genetic rule,the relationship between the particularity of meiosis in the course of spermatogenesis and oogenesis and sound child rearing and the abnormity of meiosis,etc.

提出了教学中在一般性介绍减数分裂过程的基础上,从世代交替、配子的形成、减数分裂与遗传规律之间的关系、人类精子和卵子发生过程中减数分裂的特殊性与优生优育的关系以及减数分裂异常情况等方面进行知识拓展,使学生加深对减数分裂意义的认识,拓宽相关知识结构。

alternation of generations

【生物】世代交替 [更迭]

Alternation of sexual and parthenogenic generations, as in some aphids.

世代交替双性与单性生殖交替进行，如一些蚜虫中

Characterized by reproduction involving the alternation of sexual and parthenogenetic generations.

世代交替的以涉及双性与单性生殖交替进行为特征的

no alternation of generations the medusoid phase being entirely suppressed: sea anemones; corals.

由于没有世代交替，水母阶段遭到完全抑制；海葵；珊瑚虫。

The gamete-producing phase in a plant characterized by alternation of generations.

配子体植物中以世代交替为特征的产生配子产生的阶段

coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes.

以世代交替为特色的腔肠动物；通常群居的水螅阶段先于水母阶段；水螅和水母。

Hofmeister, Wilhelm friedrich benedict(1824-77) German botanist who first demonstrated the alternation of generations in lower plants.

霍夫美施塔：是德国植物学家，第一个发现低等植物中具有世代交替的现象。

A substitution, an exchange, or an interchange.

交换代替、交换或互换

solutions, such as switches, that replace PBXes;

替代用户交换机的解决方案，如交换器；

the turn of the year/century ;the time when a new year/century starts

年度[世纪]的新旧交替时期;一年之始;世纪之初.

ALTERNATIVE AND RENEWABLE ENERGIES OF CHINA IN THE 21ST CENTURY;

中国21世纪可替代能源和可再生能源

He spent 100 days in jail working off the fines.

他在狱中呆了100天，以服刑代替交罚款。

I don't like the idea of substituting Type No.15 for the portion undelivered.

我不同意未交货部分改用15型代替。

Increasing store with loss, and loss with store;

盈和亏，得和失相互代谢交替；

The Alternating Group Explicit Iterative Method for the Partial Differential Equation;

偏微分方程的交替分组显式迭代方法

Study of the Generalized Law of Alternating Polarity;

取代烷烃极性交替规律的ab initio研究

The Realization of Expectation Damages:A Study of Substitute Transaction

期望损害赔偿的实现:替代交易的研究

The 21 st Century--A New Era: Replace Modernization With Scientific-ization;

开创21世纪的新纪元:用科学化代替现代化