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The experiment carried out by Morgan is shown in the figure to explain the phenomenon of linkage and recombination. If in cross-I, genes are tightly linked and in cross-II, genes are loosely linked then what will be the percentage of recombinants produced in cross-I and cross-II respectively?
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Important Questions on Principles of Inheritance and Variation

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
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 and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
In Morgan's experiment with Drosophila, when a yellow bodied white-eyed female was crossed with brown bodied red-eyed male and their F1 Progeny were intercrossed. What was the percentage of recombinants in the F2 generation?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Define ‘linkage’.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
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? 
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Experimental verification of the chromosomal theory of inheritance was done by
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
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.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Who proposed the chromosomal theory of inheritance?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Identify the incorrect statement from the following.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Chromosomal theory of inheritance was proposed by:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
With increasing age, the linkage ___.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes

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

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Discuss bee linkage and gene exchange.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
What map unit (Centimorgan) is adopted in the construction of genetic maps?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance gene was explained by:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes

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:

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
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?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
A cross wạs carried out between two individuals, heterozygous for two pairs of genes. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
The term ''linkage'' was coined by:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two Genes
Select the correct statement.