(A) : If in a dihybrid test cross,more parental combinations appear compared to the recombinants in the $F_2$ generation,it is indicative of the invol

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the two genes are linked and present on the same chromosome

(A) : If in a dihybrid test cross,more parental combinations appear compared to the recombinants in the $F_2$ generation,it is indicative of the involvement of linkage.Linkage is the tendency of two different genes on the same chromosome to remain together during the separation of homologous chromosomes at meiosis.During complete linkage,no recombinants are formed,whereas in incomplete linkage,a few recombinants are produced along with parental combinations.

Class 12 Biology Principles of Inheritance and Variation Linkage and recombination

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In a test cross involving $F_1$ dihybrid flies,more parental-type offspring were produced than the recombinant-type offspring. This indicates

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A
the two genes are linked and present on the same chromosome
B
both of the characters are controlled by more than one gene
C
the two genes are located on two different chromosomes
D
chromosomes failed to separate during meiosis.

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Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Linkage and recombination

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$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.
$R$ : Dihybrid test cross will have only two phenotypes.

Medium

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In order to calculate the map distance of genes on a chromosome,one must know the:

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The coupling and repulsion theory was proposed by:

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Genes $A, B$,and $C$ are linked. Genes $A$ and $B$ are closer than $A$ and $C$. Find out the correct option for the given statements:
$I.$ $A$ might be before $B$ and $C$
$II.$ $B$ might be between $A$ and $C$
$III.$ $C$ might be between $A$ and $B$
$IV.$ More crossovers have occurred between $A$ and $C$ than $A$ and $B$.

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When a test cross is performed between $F_1$ hybrid flies,the parental type offspring are produced in much higher frequency than the recombinant type offspring. What does this indicate?

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In a test cross involving $F_1$ dihybrid flies,more parental-type offspring were produced than the recombinant-type offspring. This indicates

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$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.$R$ : Dihybrid test cross will have only two phenotypes.

In order to calculate the map distance of genes on a chromosome,one must know the:

The coupling and repulsion theory was proposed by:

When a test cross is performed between $F_1$ hybrid flies,the parental type offspring are produced in much higher frequency than the recombinant type offspring. What does this indicate?

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$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.
$R$ : Dihybrid test cross will have only two phenotypes.