When two unrelated individuals or lines are crossed, performance of F₁ hybrid is often superior to

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4.Principles of Inheritance and Variation

normal

When two unrelated individuals or lines are crossed, the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called

heterosis

transformation

splicing

metamorphosis.

(AIPMT-2011)

Solution

(a): The increased vigour displayed by the offspring from a cross between genetically different parents is called heterosis. Hybrids from crosses between different crop varieties $(F_1$ hybrids) are oftenstronger and produce better yields than the original varieties.

Standard 12

Biology

Somaclonal variation appears in

normal

(AIIMS-2005)

If an albino man marries with a normal woman and $50$ offsprings are albino and $50$ are normal, the woman is

normal

Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in urine.

normal

(AIIMS-2000)

$MN$ factors are due to

normal

Sexual reproducation leads to

normal

When two unrelated individuals or lines are crossed, the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called

Solution

Similar Questions

Somaclonal variation appears in

If an albino man marries with a normal woman and $50$ offsprings are albino and $50$ are normal, the woman is

Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme. Reason : It results in the presence of phenylalanine acid in urine.

$MN$ factors are due to

Sexual reproducation leads to

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Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in urine.