NEET BIOLOGY

GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

The crossover frequency between genes E and F is 6%, between E and G is 10% andbetween F and G is 4%. What is the correct order of the genes on a chromosome?

A	E-F-G
B	F-E-G
C	F-G-E
D	E-G-F

Explanation:

Detailed explanation-1: -Crossover frequency can be determined by dividing the number of progeny resulting from crossover gametes by the total number of progeny. The crossover progeny are produced when linked genes are inherited separately rather than as a unit.

Detailed explanation-2: -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-3: -The parental chromosomes are F g and f G. 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.

Detailed explanation-4: -Answer: If the percentage of crossing over between two genes is 10, then the distance between two genes will be 10cM. Explanation: The linkage is a transmission pattern, where the two or more genes are said to be linked as they reside on the same chromosome.

There is 1 question to complete.