Question

When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called

• A. Transformation
• B. Heterosis
• C. Metamorphosis
• D. Splicing

Answer 1

The correct option is B

Heterosis

The correct option is B.

Explanation of the correct option:

1. Heterosis is the phenomenon in which hybrids of several types of a species or crosses between species.
2. They show an increase in growth, size, fecundity, function, yield, or other characteristics over their parents.

Explanation of the incorrect options:

Option A:

Transformation is the transfer of genetic material between microbial cells in the form of “naked” deoxyribonucleic acid (DNA).

Option C:

1. Metamorphosis is a biological process in which an animal physically evolves, such as through birth or hatching.
2. Metamorphosis involves a visible and relatively rapid change in the animal's body structure due to cell proliferation and differentiation.

Option D:

Splicing is a molecular biology process that transforms a newly generated precursor messenger RNA (pre-mRNA) transcript into a mature messenger RNA (mRNA).

Final answer: When two unrelated individuals or lines are crossed, the performance of the F1 hybrid is often superior to both its parents, this phenomenon is called heterosis.