Evolution occurs through___. A. natural selection B. artificial selection C. random chance D. magic 相关知识点: 试题来源: 解析 A。进化是通过自然选择发生的。选项 B“artificial selection”是人工选择;选项 C“random chance”是随机机会;选项 D“magic”是魔法。只有选项 A 符合题意。反馈...
If a biological population is fragmented in small isolated groups, there may emerge an evolution phenomenon independent from natural selection. Limited number of individuals and their isolation allow a completely random variation in their genetic frequencies, in such a way to have the predominance of ...
Biologists are somehow pioneers on the idea that progress can be driven by randomness: randomness is one of the main engine of evolution; small variations induced by randomness coupled with natural selection allows the species to self-adapt to their moving environment. Studies from the last 40 yea...
17.1.1 Sex-specific selection The fundamental dimorphism in gamete size (anisogamy) is thought to engender the contrasting reproductive strategies of females ... R Bonduriansky 被引量: 67发表: 2007年 Anisogamy, sexual selection, and the evolution and maintenance of sex 1987 . Anisogamy, sexual ...
Evolution by natural selection is a two-step process, and only the first step is random: mutations are chance events, but their survival is often anything but. Natural selection favours mutations that provide some advantage (seeEvolution promotes the survival of species), and the physical world ...
Branching Random Walk (BRW): It is a stochastic process which generalizes the branching process and the random walk process. Sign in to download hi-res image Fig. 2. Classification of classical random walk. 2.2 Parameters to be considered in the evolution of classical random walk Given an undi...
random process 美 英 un.随机过程;电抗过程 网络随机程序;随机处理;纷纭过程 英汉 网络释义 un. 1. 随机过程 2. 电抗过程
Natural selection and random genetic drift as causes of evolution on islands. The evolutionary processes responsible for adaptation and speciation on islands differ in several ways from those on the mainland. Most attention has been ... NH Barton,J Mallet - 《Evolution on Islands》 被引量: 562...
Selection could also occur later, i.e. after the fusion of the gametes during the formation of the second polar body. This is possible because in many vertebrates the second maturational division is completed only after the sperm has penetrated the vitelline membrane of the oocyte (Wolgemuth ...
Due to deficient X-linked gene expression, these cells became subject to rapid counter-selection, resulting in a surviving population of cells that had originally inactivated the Tsix-mutant X chromosome [100,101]. Tsix is thus required to prevent inactivation of the active-X only after random...