The process underlying differences in expression of a gene, according to which parent has transmitted, is called –
Correct Answer: Genomic imprinting
Description: There are functional differences between paternal and maternal genes. So the expression of gene will be different depending on, whether it has transmitted by father or mother. This is called genomic imprinting
Anticipation
In genetics, anticipation is a phenomenon where by the symptoms of a genetic disorder become apparent at an earlier age as it is passed to next generation.
In most cases, an increased severity of symptoms is also noted.
Anticipation is seen in trinucleotide repeat disorders, e.g. Huntigton's disease, myotonic dystrophy, Fragile 'X' syndrome and Friedreich ataxia.
Mosaicism
Mosaicism is the occurence of two or more different types of cell populations in the same individuals.
For example same individual have cells having 45X and 47, XXX, i.e. - 45 X / 47 XXX mosaic.
Nonpenetrance
Some individuals inherit the mutant gene but are phenotypically normal. This is referred as nonpenetrance.
Category:
Pediatrics
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