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Name two homologous structures in vertebrates. Why are they so called?
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0
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3125
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March 19, 2018
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“It is possible that a trait is inherited but may not be expressed.” Give a suitable example to justify this statement
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0
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17993
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March 19, 2018
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|
Name the organism Mendel used for his experiments
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0
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4597
|
March 19, 2018
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|
Describe the contribution of Lamarck
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0
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2428
|
March 19, 2018
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Explain analogous organs and homologous organs
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0
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943
|
March 19, 2018
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Mention three important features of fossils which help in the study of evolution.?
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0
|
772
|
March 19, 2018
|
|
Planaria, insects, octopus and vertebrates all have eyes
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0
|
1486
|
March 19, 2018
|
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“Fossils are related to evolution”, justify this statement. Give the two ways by which age of the fossils can be estimated?
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0
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3045
|
March 19, 2018
|
|
. Explain the following:Speciation Natural Selection
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0
|
1400
|
March 19, 2018
|
|
"Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. Justify this statement
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0
|
9292
|
March 19, 2018
|
|
What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained
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0
|
17720
|
March 19, 2018
|
|
In one of his experiments with pea plants Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant, in the first generation
|
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0
|
8089
|
March 19, 2018
|
|
List in tabular form, two distinguishing features between the acquired traits and the inherited traits with one example of each
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0
|
3360
|
March 19, 2018
|
|
What is speciation? List four factors responsible for speciation
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0
|
8321
|
March 19, 2018
|
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Why is variation beneficial to the species but not necessary for the individual?
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0
|
5931
|
March 19, 2018
|
|
How do variations occur in an offspring?
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0
|
5551
|
March 19, 2018
|
|
‘Different species use different strategies to determine sex of a newborn individual
|
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0
|
6547
|
March 19, 2018
|
|
“We cannot pass on to our progeny the experiences and qualifications earned during our life time”. Justify the statement giving reason and examples
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0
|
10541
|
March 19, 2018
|
|
What is DNA copying? State its importance
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0
|
21148
|
March 19, 2018
|
|
How many pairs of chromosomes are present in human beings?
|
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0
|
1065
|
March 19, 2018
|
|
List two differences in tabular form between dominant trait and recessive traits
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0
|
8594
|
March 19, 2018
|
|
A change in DNA that is useful for one property to start with, can become useful later for a different function. Explain
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|
0
|
3819
|
March 19, 2018
|
|
All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor
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0
|
756
|
March 19, 2018
|
|
Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution
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0
|
646
|
March 19, 2018
|
|
A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.?
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|
0
|
624
|
March 19, 2018
|
|
How does use and disuse of an organ help in evolution of a new species?
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0
|
1412
|
March 19, 2018
|
|
Do genetic combination of mothers play a significant role in determining the sex of a new born?
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|
0
|
703
|
March 19, 2018
|
|
What is the contribution of Mendel to genetics?
|
|
0
|
682
|
March 19, 2018
|
|
Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive
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|
0
|
773
|
March 19, 2018
|
|
What are the causes of variations?
|
|
0
|
648
|
March 19, 2018
|