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In a linear chromosome, map distance between for the loci are as follows:

p - q = 20; q - r = 8; p - s = 6; p - r = 12. The cross over frequency between r and s is:

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Important Questions on Principles of inheritance and Variation

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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
What are the significance of crossing over ?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
The genetic distance between genes A and B is 10 cM. An organism with Ab combination of the alleles is crossed with the organism with aB combination of alleles. What will be the percentage of the gametes with AB allele combination by an F1 individual?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
Write differences between linkage and crossing over.
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
Discuss bee linkage and gene exchange.
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
A plant heterozygous for height and flower colour TtRr are selfed and 1600 of the resulting seeds are planted. If the distance between the loci controlling height and the flower colour is 1 centiMorgan (cM), then how many offsprings are expected to be short with white flower ttrr? 
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
What are the conclusions drawn by T.H. Morgan from the crossing experiments in Drosophila with respect to linkage?
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
What is sex linkage?
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
The recombination frequency between the genes a and c is 5%, b and c is 15%, b and d is 9%, a and b is 20%, c and d is 24% and a and d is 29%. What will be the sequence of these genes on a linear chromosome?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over

Assertion (A): The proportion of parental gene combinations was much lighter than non-parental type

Reason (R): Gene combination is due to linkage of the two genes

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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
How did Sturtevant explain gene mapping while working with Morgan?
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
Which of the following is not a characteristic of Drosophila melanogaster?
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
What map unit (Centimorgan) is adopted in the construction of genetic maps?
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
More recombinants types are formed when
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
"Complete linkage is rare" explain it with a suitable example.
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
Identify the incorrect statement from the following.
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
Select the correct statement.
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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over

Given below are two statements one is labelled as: Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Mendel's law of independent assortments does not hold good for the genes that are located closely on the same chromosome.

Reason (R): Closely located genes assort independently.

In light of the above statements, choose the correct answer from the options given below:

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Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over

Give one significant difference between the following:

Linkage and crossing over

MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
In a dihybrid cross between genes yellow, white and miniature characters, the parental % between yellow and white and recombination % is 92 and 8 respectively, and the cross between white and miniature characters, the recombination is 38% and parental is 62%. Identify the genetic map of these.
HARD
Biology>Genetics>Principles of inheritance and Variation>Linkage and Crossing Over
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates: