Wednesday, May 4, 2011

Chapter 3-variety of living organisms and their classification(Type of fertilisation for vertebrate)

Type of fertilisation for vertebrate:

i. External fertilization/体外受精

External fertilization is a form of fertilization in which a sperm cell is united with an egg cell external to the bodies of the reproducing individuals.

体外受精是一种精子与卵子在雌性生物体外结合产生配子的一种受精方式。在这种受精形式下,精子可利用在水中运动的能力,游向卵子并与其结合。行体外受精的生物包括许多鱼类与两栖类,以及部分的植物。

ii. internal fertilization/体内受精

In contrast, internal fertilization takes place inside the female after insemination through copulation.

体内受精是一种精子与卵子在雌性生物体内结合产生配子的一种受精方式。行体内受精的生物包括许多爬虫类与鸟类,以及大部分的哺乳动物。

No comments:

Post a Comment