- AComplementary gene
- BMonogenic inheritance
- CPolygenic inheritance
- DMendelian inheritance
Explanation:
Polygenic inheritance occurs when one characteristic is controlled by two or more genes.
Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight.
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Choose the correct option for $A$ and $B$
Statement $I$ : Bt toxins are insect group specific and coded by a gene cry $IAc$.
Statement $II$ : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic $\mathrm{pH}$ of the insect gut.
In the light of the above statements, choose the correct answer from the options given below: