Linkage map of X -chromosome of fruit fly has 66 units with yellow body gene (y) at one end and bobb

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4.Principles of Inheritance and Variation

medium

The linkage map of $X$-chromosome of fruit fly has $66$ units with yellow body gene $(y)$ at one end and bobbed hair $(b)$ gene at the other end. The recombination frequency between these two genes ($y$ and $b$) should be

$100\%$

$66\%$

$> 50\%$

$5.50\%$

(AIPMT-2003)

Solution

(b) The actual distance between two genes is said to be equivalent to the percentage of crossing over between these genes i.e. $66\%$. Crossing over chances between $y$ and $b$ genes suggest that these are to be placed on the chromosome at a distance of $66$ units.

Standard 12

Biology

$A$ : Morgan's cross III was conducted in Drosophila to locate genes on chromosome for white eye colour.
$R$ : The cross was done between red eyed hybrid female and white eyed male.

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Crossing over causes

medium

(AIPMT-1991)

$A$ : Crossing over is exchange of genetic material between non-homologous chromosomes.
$R$ : It produces new linkages.

medium

Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in $\mathrm{F}_{2}$ generation for a dihybrid cross?

hard

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as

medium

The linkage map of $X$-chromosome of fruit fly has $66$ units with yellow body gene $(y)$ at one end and bobbed hair $(b)$ gene at the other end. The recombination frequency between these two genes ($y$ and $b$) should be

Solution

Similar Questions

$A$ : Morgan's cross III was conducted in Drosophila to locate genes on chromosome for white eye colour. $R$ : The cross was done between red eyed hybrid female and white eyed male.

Crossing over causes

$A$ : Crossing over is exchange of genetic material between non-homologous chromosomes. $R$ : It produces new linkages.

Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in $\mathrm{F}_{2}$ generation for a dihybrid cross?

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as

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$A$ : Morgan's cross III was conducted in Drosophila to locate genes on chromosome for white eye colour.
$R$ : The cross was done between red eyed hybrid female and white eyed male.

$A$ : Crossing over is exchange of genetic material between non-homologous chromosomes.
$R$ : It produces new linkages.