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An individual homozgous for genes cd is ...

An individual homozgous for genes cd is crossed with wild type and `F_(1)` is crossed back with the double recessive. The appearance of the offspring is a follows:
`{:(++" "-" "903),(cd" "-" "897),(+d" "-" "98),(c+" "-" "102):}`
The distance between genes c and d is

A

20 map units

B

9.8 map units

C

10.2 map units

D

10 map units

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The correct Answer is:
D
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AAKASH SERIES-PRINCIPLES OF INHERITANCE AND VARIATION-EXERCISE -II
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  4. A test cross of F(1) flies ++/ab produced the followings, ++/ab(R) 9...

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  5. Assume that genes a and b are linked and show 40 % reombination. If ++...

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  6. In a linear chromosome, map distance between four loci are as floows :...

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  7. What will be the phenotypic ratio in a situation of complementary gene...

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  8. If gene freuency between genes a and c 2%, b and c 13%, b and d 4%, a ...

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  9. The crossing over between homologous chromosomes never exceeds beyond

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  10. Cis-trans expression of genes is an example of

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  11. In genetic crosses showing recessive eipstaiss such as mice coat colou...

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  13. Chromosome map is useful for

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  14. The percentage rof recombination involving th seed shape and seed colo...

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  15. Genetic map is one that

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  16. Distance between the ganes and prcentage of recombination shows.

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  17. The type of gene mutation that involves the replacement of purine with...

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  18. Mutations induced by 5-bromo uracil are

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  19. Given below is the representation of a kind of chromosomal mutation: ...

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  20. Inversion without involving the centromere is called

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