MCQ
When a gene exists in more than one form, the different forms are called
- AHeterozygous
- BComplementary genes
- CGenotypes
- ✓Alleles
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$i.$ In transcription, adenosine pairs with uracil.
$ii.$ Regulation of lac operon by repressor is referred to as positive regulation.
$iii.$ The human genome has approximately $50,000\; genes.$
$iv. $ Haemophilia is a sex-linked recessive disease.

Choose the incorrect statement from the following
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.