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Assertion: Hybridisation is involved in ...

Assertion: Hybridisation is involved in the production of hybrid vigour or heterosis.
Reason: Hybrid is obtained by crossing the selected inbreed lines.

A

Both Assertion and Reason are true and Reason is correct explanation of Assertion.

B

Both Assertion and Reason are true, but reason is not the correct explanation of Assertion

C

Assertion is true, but the Reason is false

D

Assertion is false, but the Reason is true

Text Solution

Verified by Experts

The correct Answer is:
B
Hybrid is the result of mating between two individuals or lines differing in genotypes. The main objective of hybridisation are the development of hybrid vigour or heterosis and bringing together desirable characters of different races, varieties, etc. into hybrid.
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(A) : Hybridization results in the production of heterozygous individuals showing heterosis. (R) : Hybrids are always superior than their pure parents.

Assertion: Hybrid vigour is superior over either of its parents. Reason: Hybrid vigour is lost upon inbreeding.

Assertion: Hybridisation is mating between two or more different lines. Reason: Hybridisation is not a common method of creating genetic variation.

Assertion. Hybrid seeds must be produced every year to obtain maximum advantage of heterosis. Reason. Heterosis is lost by inbreeding

Assertion : Hybridization is done between two genetically different types of plants. Reason: Hybridization is intraspecific.

Assertion : Synapsis is involved pairing of homologous chromosomes during zygotene of meiosis. Reason : Crossing over produces variations in the cells .

OMR|Plant Hybridisation|Important Facts|Heterosis / Hybrid Vigour|Inbreeding Depression