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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
Struggle between cow and cow to get grass is called ______.
List three main factors responsible for the speciation and briefly describe each one of them
What factors could lead to the rise of a new species?
"Natural selection and speciation leads to evolution." Justify this statement.
Name one reptile in given case where higher incubation temperature leads to the development of :male progeny.
State one advantage of variation to a species.
What do you understand by the term variation?
Name two human traits which show variation.
The palisade cells of a species of plant contain 28 chromosomes. How many chromosomes will there be in each gamete produced by the plant?
A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offsprings have red petals?
(a) Which gene is dominant?
(b) Choose suitable letters to represent the two genes.
Name the scientist who gave the theory of evolution.
Name an animal having rudimentary eyes.
Name the ancestor of the following :
Broccoli, Kohlrabi, Kale
Fill in the following blank with suitable word:
Broccoli has evolved from .............. by the process of artificial selection.
Does geographical isolation of individuals of a species lead to the formation of a new species? Provide a suitable explanation for your answer.
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
State and define three factors responsible for the rise of a new species.
Define Speciation.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Speciation is the reproductive isolation amongst once interbreeding population.
Reason: Genetic drift, Natural selection, and Severe DNA change can cause speciation.
The theory of evolution of species by natural selection was given by
Cichlid fishes in Lake Victoria are representatives of ______ type of speciation.
Add a note on allopatric 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 causes observable differences to arise between separated populations over time, dividing a species into races?
