Which of the Following is an Example of Genomic Imprinting

Question

Which of the following is an example of genomic imprinting in humans?
A)One of the two X- chromosomes in females is randomly expressed and the other is repressed.
B)A random pattern of autosomal allele inactivation is observed.
C)Human males have only one Y- chromosome and one X- chromosome.
D)The maternal and paternal alleles of a gene pair are both expressed.
E)In some allele pairs,only the paternal sourced allele is expressed,and in others,only the maternal sourced allele is expressed.

Accepted Answer

Genomic imprinting refers to the differential expression of genetic material based on whether it was inherited from the mother or the father. In some cases, only the paternal or maternal allele is expressed, and this is an example of genomic imprinting. Option A refers to X-chromosome inactivation, which is not an example of genomic imprinting. Option B refers to random allelic expression, which is also not genomic imprinting. Option C is a normal sex chromosome complement and not an example of genomic imprinting. Option D refers to co-dominant expression of alleles, which is also not genomic imprinting.