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An isolated population of humans with ap...

An isolated population of humans with approximately equal numbers of blue-eyed and brown-eyed individuals was decimated by and earthquake. Only a few browneyed people remained to form the next generation. This kind of change in the gene pool is called a

A

founder effect

B

brottle effect

C

blocked gene flow

D

Hardy-Weinberg equilibrium

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The correct Answer is:
B
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Read the following passages carefully and answer the questions that follow. If you have been missing the once-familiar chirping of sparrows around your house, here's your chance to contribute to finding out why this common bird seems to have disappeared from cities across India. A two months long online survey called Citizen Sparrow was launched inviting responses from people on questions such as when they last sighted the bird and details about the area they live in. "It is an elementary step to gather information. We are encouraging people to report their experience, be it a drastic drop in sparrow count or a sudden spurt. These inputs will give us valuable leads to compile pan-India data," said Suhel Quader, evolutionary ecologist at the National Centre for Biological Sciences. The disappearance of the house sparrow, so widespread till recently that the Chinese Communist Party declared it a pest in 1958 and asked people to exterminate it, remains a great modern mystery world wide. In the UK, sparrows are estimated to have declined from over 12 million to 6 million, since the mid 70s. "The survey would give us the first baseline data about distribution of sparrows in the country. This would form the basis for further research," said Karthik K, project coordinator. The objective of involving ordinary citizens rather than experts comes with a purpose. “Almost everyone knows about sparrows. It is an attempt to reach out to people, asking them to share their stories and their understanding of these birds," said Quader. Participants in the survey would be asked to mark locations on a map and give information about their sparrow sightings, including sightings from last year and even earlier. Such information will enable a comparison of population of sparrows in different places and this is expected to point to particular threats or problems. The findings are intended to feed detailed studies investigating causes of decline and potential measures for the recovery of sparrow populations. The sparrow is an indicator of a trend. A number of other birds have also declined sharply in the past few decades. The survey would provide more clues about why these birds are disappearing. The outcome of the information collected would be to

GRB PUBLICATION-ORGANIC EVOLUTION -REPRODUCTIVE ISOLATION
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  2. The hardy-weinberg principle cannot operate if

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  3. An isolated population of humans with approximately equal numbers of b...

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  4. The eye of octopus and eye of cat show different patterns of structure...

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  5. The process by which organisms with different evolutionary history evo...

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  6. Variation in gene frequencies within populations can occur by chance r...

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  7. According of Darwin, the organic evolution is due to

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  8. Which of the following is not vestigial organ in human beings ?

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  9. Wing of pigeon is homologous to the :

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  10. Which one of the following are analogous structures

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  11. In a population of 1000 individuals 360 belong to genototype AA ,480 ...

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  12. Forelmbs of cat, lizard used in walking, forelimbs of whale used in sw...

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  13. Match Column I with Column II and choose the right option. (GRBOBJBI...

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  14. Which mechanism of evolution affects the genetic make-up in a populati...

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  15. Thorn of Bougainvillea and tendril of Cucurbita are examples of :

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  16. Industrial melanism is an :

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  17. Which one is an example of living fossil?

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  18. A population will not exist in Hardly-Weinberg equilbrium if

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  19. Choose the wrong pair :

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  20. Fossils act as evidence of organic evolution. Which one of these featu...

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