Understanding – Sex and Reproduction Part 2
For human reproduction, it takes two identities and sex.This fact that it takes two organisms to produce one organism is really a paradox in biology, because it would be much simpler just for one organism to produce one organism — virgin birth, or to have females go about just cloning themselves and producing their offspring.
在生物学上，用两个生物体产生一个生物体是非常奇怪的，因为用一个生物体产生一个生物体要简单得多——单性生殖，或者说雌性进行无性生殖，产生后代。
0254-0256
Hostess Consider the whiptail lizard.
想想鞭尾蜥蜴。
0257-0311
David Crews on camera These are parthenogenetic animals, which means they are all female. This individual will lay eggs and all of the offspring will be female, and they will be genetically identical to
M2（中年男）：这些是单性生殖的动物，这意味着它们都是雌性的。成熟的个体将产卵，所有的后代都将是雌性，而且和姐妹以及妈妈的基因相同。
0314-0330
Hostess Now, this is efficiency. A single sex. When a whiptail’s biological clock goes off, she just lays some eggs. Sex education classes for whiptails would take about three minutes. No complicated mating, or that sperm stuff. Just instant motherhood.
这是效率。单一性别。当鞭尾蜥蜴的生物钟消失时，它就产下一些卵。鞭尾蜥蜴的性教育课大约需要三分钟。没有复杂的交配，或者精子。很快就做了母亲。
0331-0354
Richard Michod M1（青年男）： on camera Life by default is female. Reproduction requires providing offspring with, with, ah, nourishments and, and resources and, and so, ah, this is the female function. Um, and asexual species, species that don’t have sex, are always all female, um, with, without any males. And so the female function has to exist for life to exist.
雌性是生命存在的基础。繁殖需要为后代提供营养和生存手段，这是雌性的作用。无性物种，也就是没有性别的物种，一般都是雌性，没有雄性。生命要想存在，雌性的作用就必须存在。
0354-0359
Female #1 on camera As you all know, for one thing and one thing only do we need men!
W1（青年女）：大家都知道，我们只有一件事情需要男人！
0400-0402
Female #2 on camera Can’t you do any better than that?
W2（青年女）：你不能做得比这更好吗？
0404-0424
David Crews M2（中年男）： on camera The way I like to think of it is that the female is the ancestral sex. In evolution, the first individuals, replicating individuals, had to have been what we call a female-type of individual, and that males evolved after those kinds of individuals.
我认为雌性是最先出现的性别。在进化过程中，最早出现的个体一定是雌性个体，在那些个体之后才进化产生了雄性。
0431-0440
Hostess But even here among the virgins, there is something else going on. They don’t have any need or even equipment for mating, but that doesn’t seem to stop them from trying.
但即使在单性生殖的动物中，也有出格的事情发生。它们不需要交配，也没有交配工具，但这似乎并不妨碍它们尝试。
0442-0455
David Crews M2（中年男）： These individuals will interact in a way where one individual will take a male-like role. The other individual will take a female-like role. And in so doing, they will stimulate one another to lay eggs.
这些个体将相互作用。一个个体扮演雄性的角色，另一个个体扮演雌性的角色，通过这样做来互相刺激产卵。
0459-0505
Hostess But if males aren’t necessary for reproduction, why is there sex at all? Why did males evolve?
但是如果繁殖不需要雄性，为什么会有性别之分？为什么会产生雄性？
Related posts
Thank you for visting iflove.com, the fairy legend of Edward Chen the Movie Star! You may want to Find Love or subscribe to RSS feed. Enjoy or do a search!