Q161 / 180 · NEET 2013 (All India) · Zoology

Which of the following statements is not true of two genes that show $50 \%$ recombination frequency?

  • A
    the genes may be on different chromosomes
  • Correct answer
    B
    the genes are tightly linked
  • C
    the genes show independent assortment
  • D
    if the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis

Solution

The tightly linked genes on chromosomes show $100 \%$ parental types and $0 \%$ recombinants. Two genes that undergo independent assortment indicated by a recombinant frequency of $50 \%$ are either on non- homologous chromosomes are located far apart in a single chromosome. As the distance between two genes increases, crossover frequency increases. More recombinant gametes, fever parental gametes.

Hence, the correct answer is option: 'B'.

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