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प्रश्न
What is meant by speciation?
What is speciation?
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उत्तर
The formation of a new species by evolution or any genetic modification of the previously existing species in a population is called speciation.
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संबंधित प्रश्न
Explain the following:- Speciation
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
List four factors responsible for speciation.
Name one reptile in given case where higher incubation temperature leads to the development of :male progeny.
What do you understand by the term variation?
Name two human traits which show variation.
How does the creation of variation in a species ensure its survival
In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be ______.
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to same species?
Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.
Choose the one term from the following which includes the other three :
broccoli, wild cabbage, cauliflower, cabbage
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
With the help of an example, explain how variation leads to evolution.
What is meant by a species?
The human species has genetic roots in ______
Which of the following statement is incorrect with respect to variations?
(a) all variations in a species have equal chance of survival
(b) change in genetic composition results in variations
(c) selection of variations by environmental factors forms the basis of evolutionary process
(d) variations are the minimum in asexual reproduction
New species may be formed if:
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
List any two factors that could lead to speciation.
Define speciation according to A.E. Emerson.
The theory of evolution of species by natural selection was given by
Cichlid fishes in Lake Victoria are representatives of ______ type of speciation.
Arrange the major events as per geological time scale:
(Origin of conifers, Abundance of trilobites, Diversification of fishes, All types of marine algae, Formation of Forests, Rise of dinosaurs, Extinction of seed ferns, Rise of modern insects.)
| Geological time period |
Major events | |
| 1. | Cambrian | ______ |
| 2. | Devonian | ______ |
| 3. | Permian | ______ |
| 4. | Triassic | ______ |
What is the evolutionary process by which new, distinct species are formed?
Despite differing morphological characters and gene frequencies, the five main racial groups of human beings are members of which same species?
