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

Give scientific reasons : Linkage and crossing over of genes are alternatives of each other.

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Who clearly proved and define linkage?

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Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their $F_{1}$ progeny. He observed that

$(a)$ $F_{2}$ ratio was deviated very significantly from the $9 : 3 : 3 : 1$ ratio

$(b)$ Both genes did not segregate independently of each other

$(c)$ Recombinant types are not obtained in $F_{2}$ generation

$(d)$ Both genes segregate independently of each other

Select the correct set of statements :

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What is recombination ? Discuss the applications of recombination from the point of view of genetic engineering.

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

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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

Give scientific reasons : Linkage and crossing over of genes are alternatives of each other.

Who clearly proved and define linkage?

What is recombination ? Discuss the applications of recombination from the point of view of genetic engineering.

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

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