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प्रश्न
What is a species?
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उत्तर
A species is a group of organisms that can produce fertile individuals through natural reproduction.
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संबंधित प्रश्न
Explain the following:- Speciation
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?
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.
State one advantage of variation to a species.
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
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?
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Does geographical isolation of individuals of a species lead to the formation of a new species? Provide a suitable explanation for your answer.
How are those species which are now 'extinct' studied?
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.
In human males, all the chromosomes are paired perfectly except one. These unpaired chromosomes are ______
(i) Large chromosome
(ii) Small chromosome
(iii) Y chromosome
(iv) X chromosome
Cichlid fishes in Lake Victoria are representatives of ______ type of speciation.
