HARD
Earn 100

An individual homozygous for genes cd is crossed with wild type and F1 crossed back with the double recessive. The appearance of the offspring is as follows
+ + →        903
cd →         897
+d →         98
c+ →         102

The distance between the genes c and d is ----------------.

50% studentsanswered this correctly

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?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes
How did Sturtevant explain gene mapping while working with Morgan?
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
Which of the following is not a characteristic of Drosophila melanogaster?
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:
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
Identify the event in meiosis mediated by the enzyme recombinase.
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:

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

Give one significant difference between the following:

Linkage and crossing over

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.