MCQ
Mobile genetic elements in maize were discovered by ___________:
- AD. Baltimore
- BH. G. Khorana
- CN. E. Borlaug
- DB. McClintock
Explanation:
A transposable element is a DNA sequence that can change its position within a genome, sometimes creating or reversing mutations and altering the cell's genetic identity and genome size.
They are also termed as mobile genetic elements. Barbara McClintock discovered the first transposable elements in maize (Zea mays) at the Cold Spring Harbor Laboratory in New York and earned a noble prize in 1983.
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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.
Statement $I$:
Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance
Statement $II$ :
Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height
In the light of the above statements, choose the correct answer from the options given below: