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Assume that genes a and b are linked and...

Assume that genes a and b are linked and show 40 % reombination. If ++/++ individual is crossed with ab/ab, then tpes and proportions of gametes in `F_(1)` will be

A

`++20%:ab20:+20%:a+40%`

B

`++50%:ab50%`

C

`++25%:ab25%:+b25%:a+25%`

D

`++30%:ab30%:+b20%:a+20%`

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The correct Answer is:
D
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Individuals homozygous for ab genes were crossed with wild type (++). The F_(1) hybrid thus produced was test crossed. It produces progeny in following proportion. Now, calculate the distance between a and b genes.

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

AAKASH SERIES-PRINCIPLES OF INHERITANCE AND VARIATION-EXERCISE -II
  1. An individual homozgous for genes cd is crossed with wild type and F(1...

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  2. A test cross of F(1) flies ++/ab produced the followings, ++/ab(R) 9...

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

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

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

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

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  7. The crossing over between homologous chromosomes never exceeds beyond

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

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

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  10. Independent genes that copy other genes so as to produce a similar eff...

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  11. Chromosome map is useful for

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

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  13. Genetic map is one that

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

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

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  16. Mutations induced by 5-bromo uracil are

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

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  18. Inversion without involving the centromere is called

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  19. Asneuploidy which results in the loss of a complete homologous pair of...

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  20. Crtoplasmic male sterlity in maize is due to defective

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