HARD
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In Drosophila cross, the heterozygous member with grey body (b+) and long wings (vg+) was crossed with black body and vestigial wings, the progeny had the following ratio; grey vestigial 24: grey long 126: black long 26: black vestigial 124. What is the frequency of recombinants in the population?

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Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
Two genetic loci controlling two different traits two different traits are linked. During the inheritance of these traits, the Mendelian laws that would be affected is/are:
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

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

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
Alkaptonuria (aa) is which type of error?
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
Write differences between linkage and crossing over.
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 ___.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
How did Sturtevant explain gene mapping while working with Morgan?
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:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Give one significant difference between the following:

Linkage and crossing over

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
Identify the event in meiosis mediated by the enzyme recombinase.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
What is sex linkage?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
What are the conclusions drawn by T.H. Morgan from the crossing experiments in Drosophila with respect to linkage?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
"Complete linkage is rare" explain it with a suitable example.
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.