Biology GK · all questions

Gentics and Evoloution
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Q141

Which one of the following is an example of vestigial organ in man?

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Q142

Crops usually take nitrogen from the soil in the form of

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Q143

According to Darwin's theory of evolution, long necks in giraffes

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Q144

In the history of plant tissue culture, the first tissue to be cultured as a callus came from hybrid

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Q145

Fitness according to Darwin refers to

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Q146

The paper entitled "Nondisjunction as a Proof of Chromosome Theory of Heredity" was described by

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Q147

The tendency towards the development of which of the following seems to be more stable?

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Q148

According to Mendel's explanation, when two factors for alternative expression of a trait are brought together by fertilization,

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Q149

The study of extinct animals is called

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Q150

Which of the organs given below is/are homologous?
1. Flipper of a seal
2. Wing of a bat
3. Arm of a man
4. Wing of a moth
Which of the statements given above is/are correct?

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Q151

Which of the following is a vestigial organ?

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Q152

. . . . . . . . is a scientific discipline concerned with the study of plant pollen, spores and certain microscopic planktonci organisms, in both, living and fossil form.

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Q153

Alterations of DNA involving only one, or only a very few, nucleotides are called

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Q154

The removal of stamens from the female parent before they burst and have their pollens is called

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Q155

If a dominant gene A is lost in a deletion, then the recessive gene a will express itself.
This expression of a recessive trait is called

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Q156

Consider the following statements regarding the origin of polyploidy and choose the correct answer:
1. The egg may be fertilized by more than one sperm
2. There may be a failure of mitosis
3. Triploids may arise as a result of fertilization of unreduced gametes
4. An autotetraploid may arise either by the doubling of chromosomes or fertilization between two different gametes

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Q157

Autopolyploidy can be induced artificially by the use of a chemical called

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Q158

Consider the following statements regarding genetic code and choose the correct answer:
1. The genetic code is degenerate
2. In all amino acids the first two bases are the same in all the codons that represent a particular amino acid
3. The number of codons an amino acid can claim is proportional to the frequency of the amino acid in proteins
4. Amino acids with codons ending in U or A also have codons ending in C or G respectively

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Q159

The characteristics of 'The chromosome theory of linkage', formulated by Morgan and Castle, include:

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Q160

The relationship between the sequence of bases in DNA / RNA and the sequence of amino acids in a polypeptide chain is called the

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