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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In order to calculate the map distance of genes on a chromosome,one must know the:

When closely placed genes on the same chromosome are inherited together,the phenomenon is known as:

Which of the following represents the frequency of recombination between two genes that are inversely proportional to the strength of linkage?

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as

When the number of recombinant progeny is usually less than the number expected in independent assortment, it is called:

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