Advertisements
Advertisements
प्रश्न
Had Darwin been aware of Mendel’s work, would he been able to explain the origin of variations. Discuss.
उत्तर
Yes, Darwin has been aware of Mendel’s work. Even though Mendel had talked of inheritable ‘factors’ influencing phenotype, Darwin either ignored these observations or kept silence. Darwin would have been able to explain the origin of variations. He asserted that variations, which are heritable and which make resource utilisation better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny. Hence for a period of time, over many generations, survivors will leave more progeny and there would be a change in population characteristic and hence new forms appear to arise.
APPEARS IN
संबंधित प्रश्न
According to de-Vries what is saltation?
Define evolution. How does it occur?
Insects, octopus, planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason.
In evolutionary terms, we have more in common with
How are the areas of study – evolution and classification – interlinked?
Give the respective scientific terms used for studying the development of new type of organisms from the existing ones.
Some plants occur in one of the two sizes : tall or dwarf. This characteristic is controlled by one pair of genes. Tallness is dominant to dwarfness. Choose suitable letters for this gene pair.
According to scientists, aves have evolved from :
(a) mammals
(b) amphibians
(c) reptiles
(d) arthropods
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are analogous organs?
Short answer question.
Draw a graph to show that natural selection leads to disruptive change.