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In maize plants coloured grain is dominant over colourless and full grain is dominant over shrunken grain. A heterozygote for coloured and full grain was test crossed and following results were obtained
(A) Coloured and Full = 205
(B) Coloured and Shrunken = 16
(C) Colourless and Full = 14
(D) Colourless and Shrunken = 200
If the two genes responsible for colour and Shape are linked then, determine the distance between these linked genes
12.6 cM
16.9cM
6.9 cM
7.4 cM
Answers (1)
To determine the distance between the two linked genes responsible for colour and shape in maize, we can use the data from the test cross.
The data provided is as follows:
(A) Colored and Full = 205
(B) Colored and Shrunken = 16
(C) Colourless and Full = 14
(D) Colourless and Shrunken = 200
To calculate the distance between the linked genes, we need to determine the frequency of recombination events (crossing over) between the two genes.
The formula to calculate the recombination frequency is:
Recombination frequency = (Number of recombinant progeny / Total number of progeny) * 100
From the data provided:
Number of recombinant progeny = (B) Colored and Shrunken + (C) Colourless and Full = 16 + 14 = 30
Total number of progeny = Sum of all categories = (A) + (B) + (C) + (D) = 205 + 16 + 14 + 200 = 435
Recombination frequency = (30 / 435) * 100 = 6.89%
The recombination frequency represents the distance between the two linked genes on the genetic map. Therefore, the distance between the linked genes responsible for colour and shape in maize is approximately 6.9 cM.
Thus, the correct answer is: 6.9 cM.
Hence, the correct answer is option 3.
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