Q. Which of the following statements are correct? I. Directional selection favours one extreme form over the other extreme and over intermediate forms of a trait II. Stabilising selection favours the intermediate forms of a trait III. Disruptive selection favours both the extreme forms of a trait IV. Fossils are the remnents of hard parts of life forms present in rocks V. A study of fossils in different sedimentary layers indicates the geological period in which they live VI. Radio isotopes are often used to determine the age of the fossils VII. Study of fossils is called Palaeontology VIII. Most fossils are found in sedimentary rocks IX. The unit of evolution is population
A) All except I, III and X
B) All except IV, V and II
C) All except VII, V and IX
D) All of the above
Explanation
All except IV, V and II. Hugo de Vries believed that mutation causes evolution and not the minor heritable variations, which was mentioned by Darwin Mutation are random and directionless, while Darwin’s variations are small and directional Term ‘saltation’ is also called single step large mutation, which leads to new specks
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.