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Breakage, exchange and rejoining of homo...

Breakage, exchange and rejoining of homologous chromosomal segments.

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Genetic recombination
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Pairing of homologous chromosomes

A pair of homologous chromosomes

Separation of homologous chromosomes.

Homologous compounds have:

Assertion: Crossing over leads to recombination of genetic material on the two chromosomes. Reason: Crossing over is the exchange of genetic material between two homologous chromosomes.

In which phase of meiosis homologous chromosomes seperates?

The members of a homologous pair of chromosomes

Four different steps that occur during meiosis are given in the following list. (i) Complete separation of chromatids (ii) Pairing of homologous chromosomes (iii) Lining up of paired chromosomes on equator (iv) Crossing over between chromatids Select the correct sequential arrangement of the steps.

Which of the following is correct about bivalent? (i) Bivalents are tetrads. (ii) A bivalent means 4 chromatids and 2 centromeres. (iii) One bivalent consists of 2 homologous chromosomes. (iv) Bivalents form in zygotene.

ARIHANT PUBLICATION-EVOLUTION-ODISHA BUREAU.S TEXTBOOK SOLUTIONS (Very Short Answer Type Questions )
  1. Protenoids, when dissolved in water by boiling and then cooling, organ...

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  2. Buffon, Erasmus Darwin and Lamarck proposed theories on organic evolut...

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  3. Name the naturalist, who proposed that ontogeny recapitulates phylogen...

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  4. Name the theory, which explains about the origin of amphibians from aq...

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  5. DNAtoRNAtoProtein concept.

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  6. Genetic recombination occurs in cell division. Name the cell division.

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  7. Hugo de vries proposed mutation theory of evolution working on .

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  8. Breakage, exchange and rejoining of homologous chromosomal segments.

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  9. A single nucleotide substitution in the nucleotide sequence of a gene.

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  10. The collection of all genes of a population of species.

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  11. A sudden change in the genetic make up that ends up in a new expressio...

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  12. The primitive atmosphere was reducing.

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  13. Heterotrophic organisms with aerobic respiration evolved prior to ana...

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  14. What is genetic drift?

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  15. Serum proteins of closely related animals are similar in their amino a...

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  16. Reptiles flourished in the Palaeozoic era.

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  17. Close similarity in the nucleotide sequence between two organisms depi...

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  18. Numerical changes, involving one or both chromosomes of a homologous p...

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  19. Genetic drift is the main driving force of evolution in a large random...

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  20. Discontinuous variation is the product of mutation.

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