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Question
List three main factors responsible for the speciation and briefly describe each one of them
Solution
The process by which new species develop from the existing species is known as speciation. The important factors which could lead to speciation are:-
i. Geographical isolation of a population caused by various type of barriers such as mountain ranges, rivers and seas.
ii. Genetic drift caused by drastic changes in the frequencies of particular genes by chance alone.
iii. Variations caused in individuals due to natural selection.
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RELATED QUESTIONS
"Natural selection and speciation leads to evolution." Justify this statement.
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) 56
(b) 28
(c) 14
(d) 4
Which of the following may be used to obtain an F2 generation?
(a) allowing flowers on a parent plant to be self-pollinated
(b) allowing flowers on an F1 plant to be self-pollinated
(c) cross-pollinating an F1 plant with a parent plant
(d) cross-pollinating two parent plants
Name the famous book written by Charles Robert Darwin.
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Give reason for your answer.
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
According to the evolutionary theory, the formation of a new species is generally due to ______
The process by which new species develop from the existing species is known as ______
Add a note on sympatric speciation.
Complete the following chart:
| Animals | Connecting link between | |
| (1) | Balanoglossus | ______ |
| (2) | ______ | Annelida and Arthropoda |
| (3) | Lung fishes | ______ |
| (4) | ______ | Reptiles and mammals |
| (5) | Seymouria | ______ |
| (6) | Fishes and Amphibia |
