Biology GK · all questions

Gentics and Evoloution
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Q461

According to Mendel, a cross between round yellow and wrinkled green seeds produced the offspring of F₂ generation in the ratio of 9 : 3 : 3 : 1. This ratio is called

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Q462

Starvation induces a system of control of gene expression that allows the cell to tide over unfavourable conditions by minimizing its energetic activities. This type of gene regulation is known as

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Q463

Sex-determination by environment factors is commonly observed in

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Q464

Who among the following analysed DNA for the first time?

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Q465

Which of the following is known to infect the larval stages of many harmful insects such as ants, wasps, gnats and beetles?

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Q466

The self-ordering, self-assembly, self-replication of the protocells manifest a kind of evolutionary process called

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Q467

The carbon cycle moves through a series of six steps during which four protons are captured by a carbon nucleus, forming

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Q468

If crossing over occurs within the loop of a pericentric inversion, then the resulting chromatids have

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Q469

Which of the following elements are designated as major or primary nutrients?

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Q470

The mutation theory of evolution was enunciated by

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Q471

Consider the following statements regarding aneuploids and choose the correct answer:
1. Aneuploidy may arise by the perpetuation of a cell in which, through a failure of anaphase of mitosis, one or more chromosomes may be lost
2. Aneuploidy in diploids is much less viable than aneuploidy in polyploids
3. In true aneuploids there are complete genomes, plus a fraction of a genome
4. False aneuploids may contain supernumerary chromosomes

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Q472

The universality of genetic code was demonstrated by

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Q473

Consider the following statements regarding Natural Selection and choose the correct answer:
1. Organisms produce many more offsprings than can possibly survive
2. In a population some variability is always present for almost every characteristic
3. All offsprings are able to survive to reach adulthood

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Q474

The herbicide which controls the growth of milk weed vines in citrus orchards is

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Q475

RNA always occurs in

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Q476

Which of the following is a natural radioactive form, produced in the atmosphere?

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Q477

Gregor Johann Mendel is famous for propounding

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Q478

Which of the following isotopes, on decay, gives off γ-rays and ∝-particles only?

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Q479

The variations observed among plants regenerated from tissue culture have been termed as

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Q480

Who among the following is considered as the 'Father of evolution idea' for his ideas forwarded in his 'Poem of Nature'?

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