Which one of the following statements is $NOT$ true regarding crossing over during meiosis?

  • A
    Crossing over increases the chances of variations.
  • B
    It is necessary for natural selection.
  • C
    It is an universal phenomenon.
  • D
    Closely located linked genes are always separated during crossing over.

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Define/Explain: Linkage.

Which of the following combinations of characters selected by Mendel shows linkage?

In diploid organisms,crossing over is responsible for which of the following?

Drosophila has four pairs of chromosomes. How many linkage groups does it have?

The evidence that crossing over occurs at the four-stranded stage and not at the two-stranded stage of the chromosomes comes from:

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