Biology
Grade-10
Easy
Question
How many imprinted genes have been identified in humans?
100
200
125
55
100
200
125
55
Hint:
100
The correct answer is: 100
About 150 imprinted genes (IGs) are known in mice and close to 100 in humans. Some of them have been identified following the molecular characterisation of chromosomal rearrangements or uniparental disomies causing clinical syndromes (Prader–Willi syndrome and Beckwith–Wiedemann syndrome, for instance).
Only a small percentage of all human genes undergo genomic imprinting. Researchers are not yet certain why some genes are imprinted and others are not. They do know that imprinted genes tend to cluster together in the same regions of chromosomes.
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Genomic imprinting leads to the ____________ of a particular allele of certain genes.
Genomic imprinting leads to the ____________ of a particular allele of certain genes.
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In Igf2 gene in mice, only ______________ allele is expressed.
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the antagonistic pleiotropy hypothesis was first proposed by George C. Williams in 1957.
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the antagonistic pleiotropy hypothesis was first proposed by George C. Williams in 1957.
