Heterosis isa)Hybrid compatibilityb)Hybrid vigourc)Pollen sterilityd)Pollen-pistil incompatibilityCorrect answer is option 'B'. Can you explain this answer?

Question

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The tendency of a cross-bred individual to show qualities superior to those of both parents.

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Heterosis is increased vigours, growth, yield or function of a hybrid over the parents resulting from crossing of genetically unlike organisms

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Explanation:

Hybrid Vigour:

Heterosis or hybrid vigour refers to the phenomenon where the offspring of two genetically diverse parents exhibit superior qualities than their parents. The hybrid plants show greater growth, yield, and resistance to diseases and pests. This is due to the combination of favorable genes from both parents.

Hybrid Compatibility:

Hybrid compatibility refers to the ability of two different species to produce viable offspring. If the parents are closely related, then the offspring may be sterile, but if the parents are distantly related, then the offspring may be fertile.

Pollen Sterility:

Pollen sterility refers to the inability of pollen grains to produce viable sperm cells. This may occur due to genetic mutations or environmental factors. In some cases, the plants may produce partially sterile pollen, which can result in reduced fertility.

Pollen-Pistil Incompatibility:

Pollen-pistil incompatibility refers to the inability of pollen grains to germinate on the stigma of the same plant or a different plant. This may occur due to genetic differences between the pollen and pistil or due to environmental factors.

Therefore, the correct answer is option B, hybrid vigor, as heterosis refers to the superior qualities exhibited by hybrid offspring due to the combination of favorable genes from both parents.

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Heterosis is the contribution of 2 different parents to form a new organism that have the character of both ....(hybrid vigour)

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Heterosis, also called hybrid vigour the increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits.

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