In a test cross involving F₁ dihybrid flies, more parentaltype offspring were produced than r

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4.Principles of Inheritance and Variation

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In a test cross involving $F_1$ dihybrid flies, more parentaltype offspring were produced than the recombinanttype offspring. This indicates

the two genes are linked and present on the same chromosome

both of the characters are controlled by more than one gene

the two genes are located on two different chromosomes

chromosomes failed to separate during meiosis.

(NEET-2016)

Solution

(a): If in a dihybrid test cross more parental combinations appear as compared to the recombinants in $F_2$ generation, then it is indicative of involvementof linkage. Linkage is the tendency of two differentgenes 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 few recombinants are produced along with parental combinations.

Standard 12

Biology

Two genes $R$ and $Y$ are located very close on the chromosomal linkage map of maize plant. When $RRYY$ and $rryy$ genotypes are hybridized, then $F_{2}$-segregation wii show

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If gene exchange rate is $30\%$ of the two linked genes, then the distance between these two genes is

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Select the correct statement from the ones given below with respect to dihybrid cross.

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(AIPMT-2010)

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

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The map distance between genes $A$ and $B$ is $3$ units, between $B$ and $C$ $10$ units and between $C$ and $A$ $7$ units. The order of the genes in a linkage map constructed on the above data would perhaps be

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In a test cross involving $F_1$ dihybrid flies, more parental­type offspring were produced than the recombinant­type offspring. This indicates

Solution

Similar Questions

Two genes $R$ and $Y$ are located very close on the chromosomal linkage map of maize plant. When $RRYY$ and $rryy$ genotypes are hybridized, then $F_{2}$-segregation wii show

If gene exchange rate is $30\%$ of the two linked genes, then the distance between these two genes is

Select the correct statement from the ones given below with respect to dihybrid cross.

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

The map distance between genes $A$ and $B$ is $3$ units, between $B$ and $C$ $10$ units and between $C$ and $A$ $7$ units. The order of the genes in a linkage map constructed on the above data would perhaps be

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In a test cross involving $F_1$ dihybrid flies, more parentaltype offspring were produced than the recombinanttype offspring. This indicates