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NEET2022ZoologyPrinciples of Inheritance and VariationActual

The recombination frequency between the genes a and c is 5 % , b and c is 15 % , b and d is 9 % , a and b is 20 % , c and d is 24 % and a and d is 29 % . What will be the sequence of these genes on a linear chromosome?

Options

  1. Ad,b,a,c
  2. Ba,b,c,d
  3. Ca,c,b,d
  4. Da,d,b,c

Correct answer

C. a,c,b,d

Step-by-step solution

The recombination frequency is directly proportional to the distance between genes, and the recomination values are used to locate the genes on a chromosome. Here, four genes a, b, c, and d are present with their recombination frequency of a - c = 5%, b – c = 15%, b - d = 9%, a – b = 20%, c – d = 24%, a – d = 29%. The correct sequence of genes is a-c-b-d , and this is in accordance with the recombination frequency. 29% is the highest recombination frequency present between a and d, this sign

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