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प्रश्न
What is species and speciation?
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उत्तर
- Species is a group of organisms that can produce fertile individuals through natural reproduction.
- Speciation is the formation of new species of plants and animals as an effect of evolution.
APPEARS IN
संबंधित प्रश्न
Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? 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.
A plant with two 'small' genes breeds with a plant with two 'tall' genes to produce :
(a) small plants and tall plants in the ratio 1 : 3
(b) all small plants
(c) all tall plants
(d) tall plants and small plants in the ratio 3 : 1
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 ______.
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.
What name is given to the sequence of gradual changes over millions of years in which new species are produced?
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.
How are those species which are now 'extinct' studied?
Define 'speciation'. Explain how speciation occurs.
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Give reason for your answer.
List any two factors that could lead to speciation.
Define speciation according to A.E. Emerson.
Add a note on allopatric speciation.
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 |
