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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22 map units
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10 map units
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15 map units
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2 map units
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Detailed explanation-1: -The closer two genes were to one another on a chromosome, the greater their chance of being inherited together. In contrast, genes located farther away from one another on the same chromosome were more likely to be separated during recombination.
Detailed explanation-2: -Explanation: There are certain sites on DNA, which have a high probability of crossing over called hot spots and those sites which have a low probability of crossing over are called cold spots.
Detailed explanation-3: -The genetic distance between genes A and B is 10 cm as given. Therefore, the recombination frequency is 10%. If the cross happens between two parents having genotype Ab and aB, their progeny, 10% will be formed of recombinant type (that is AB and ab) and 90% will be formed parental type (that is aB and Ab).
Detailed explanation-4: -The map distance (30 m.u.) is equal to the recombination frequency, so 30% of gametes will be recombinant, but there are two types of recombinants, so 15% will be F G and 15% will be f g.