| 1. | The process by which new species develop from the existing species is known as ? | |
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Artificial selection
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Speciation
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Natural selection
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Evolution
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Report Question| 2. | What is the difference between genetic drift and change due to natural selection ? | |
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Genetic drift does not require the presence of variation.
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Genetic drift does not involve competition between members of a species.
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There is no difference.
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Genetic drift never occurs in nature, natural selection does.
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| 3. | The main reason of Mendel's successs in discovering the principles of inheritance was ? | |
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The plant was pure breeding
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He was lucky not to encounter linkage problem
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He considered each character separately
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All the above
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| 4. | Alleles are ? | |
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Linked genes
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Chromosome that have crossed over
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Homologous chromosome
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Alternate forms of gene
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| 5. | The results of a test cross reveal that all the offspring resemble the parent being tested. This parent must be ? | |
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homozygous
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haploid
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recessive
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heterozygous
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| 6. | Mendel studied seven contrasting characters for his breeding experiment with Pisum sativum, which of the following character did he not use ? | |
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Leaf shape
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Plant height
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Pod shape
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Pod colour
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| 7. | Which of the following statements is not true with respect to variation ? | |
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Variation is minimum in asexual reproduction
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All variations in a species have equal chance of survival
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Selection of variants by environmental factors forms the basis of evolutionary processes.
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Change in genetic composition results in variation
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| 8. | The remaps (or impressions) of dead animals or plant? that lived in the remote past are known as ? | |
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naturally selected species
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extinct species
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fossils
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none of the above
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| 9. | A cross between a tall pea-plant (TT) and a short pea-plant (tt) resulted in progenies that were all tall plants because ? | |
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tallness is the dominant trait.
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height of pea-plant is not governed by gene T or t.
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shortness is the dominant trait.
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tallness is the recessive trait.
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| 10. | Two pink colored flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. the nature of the cross will be ? | |
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No fertilization
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Cross fertilization
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Self-pollination
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Double fertilization
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