Biology GK · all questions

Gentics and Evoloution
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Q301

Mutation may results in the

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Q302

The first successful production of haploid plants was performed by Guha and Maheswari (1964) who cultured anthers of

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Q303

Miller synthesised simple amino acids from one of the following mixtures in his experiment

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Q304

Double-helical structure of DNA was given by whom?

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Q305

Gynandromorph is

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Q306

The strength of linkage is

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Q307

DNA fingerprinting is used to identify the

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Q308

Mutation is phenomena which results in alternation of

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Q309

The capability of nitrogen-fixation by certain bacteria has been traced to a set of genes, called the

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Q310

Match List-I with List-II and select the correct answer:

List-I	List-II
a. Intravarietal hybridization	1. The plants of two different species belonging to the same genus are crossed together
b. Intervarietal hybridization	2. The crosses are made between the plants belonging to two different genera
c. Interspecific hybridization	3. The crosses are made between the plants of two different varieties of the same species
d. Intergeneric hybridization	4. The crosses are made between the plants of the same variety

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Q311

In the absence of polymerase-I which of the following can elongate Okazaki fragments?

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Q312

Who among the following disproved the theories of 'spontaneous generation' and demonstrated once and for all that life originates only from pre-existing life?

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Q313

Trisomy of chromosome A in Datura stramonium can be represented as 2n + A, and is characterised by

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Q314

DNA in a cell is a

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Q315

Which is the oldest organism on earth

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Q316

Gaucher's disease is associated with abnormal metabolism of

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Q317

Which of the following is the X-linked genetic disease?

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Q318

Who among the following defined linkage 'the tendency of the genes, as present in the same chromosome, to remain in their original combination and to enter together in the same gamete'?

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Q319

Consider the following statements and choose the correct answer:
1. It is in the sedimentary rocks that fossils are found
2. Sedimentary rocks arise as a result of gradual deposition of silt or silica at the bottom of lakes or seas
3. Igneous rocks are those in which the original structure has been changed by heat or pressure
4. Entire plants or animals or more commonly their parts are found fossilised

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Q320

The internal agents in an organism which may be responsible for mutagenic effects include

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