GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gene A, B, and C are on the same chromosome. Gene A separates from gene B 15% of the time and gene B separates from gene C 2% of the time. How far apart are genes A and C in gene map?
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2 map units
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15 map units
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17 map units
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30 map units
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Explanation:
Detailed explanation-1: -The cross over frequencies between the genes A and B, A and C, and B and C is 6%, 15% and 21% respectively.
Detailed explanation-2: -Unlinked genes may be on different chromosomes, or so far apart on the same chromosome that they are often separated by recombination.
Detailed explanation-3: -Recombination frequency between gene A and B is 10 % and between B and C is 20 % .
Detailed explanation-4: -We can see if two genes are linked, and how tightly, by using data from genetic crosses to calculate the recombination frequency. By finding recombination frequencies for many gene pairs, we can make linkage maps that show the order and relative distances of the genes on the chromosome.
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