$RNA$ is a genetic material in

  • A

    Tobacco mosaic virus

  • B

    Cyanobacteria

  • C

    Chladophora

  • D

    Sieve cells

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The genes, which are confined to differential region of $Y$ chromosome only, are called

  • [AIPMT 1994]

Whereas the number of chromosomes is reduced to half in first reduction division of meiosis, then what is the need for second mitotic division

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$A$ : Wobbling reduces the number of $tRNAs$ required for polypeptide synthesis.
$R$ : It increases the effect of code degeneracy

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