Convergent evolution | Divergent evolution | |
---|---|---|
(a) | Eyes of octopus and mammals | Bones of forelimbs of vertebrates |
(b) | Thorns of Bougainvillea and tendrils of Cucurbita | Wings of butterfly and birds |
(c) | Bones of forelimbs of vertebrates | Wings of butterfly and birds |
(d) | Thorns of Bougainvillea and tendrils of Cucurbita | Eyes of octopus and mammals |
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.