Answer:
In some allele pairs, only the paternal sourced allele is expressed, and in others, only the maternal sourced allele is expressed.
Explanation:
Genomic imprinting is an epigenetic phenomenon where alleles are differentially expressed depending on their parental origin (for example, paternally expressed when it is inherited from the father). Genomic imprinting is controlled by epigenetic modifications (for example, DNA methylation, histone acetylation, etc) which works together to preferentially activate the expression of the allele inherited from one parent and simultaneously silence or “imprint” the expression of the allele inherited from the other parent. In humans, an example of genomic imprinting is the case of the insulin-like growth factor 2 (Igf2) gene, which is maternally imprinted (repressed), thereby this gene is only expressed from the paternal allele.
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Answer:
Yes, you are right for both.
The average menstrual cycle is about 28 days long, ovulation occurs on about day 14 . The menstrual cycle can be divided into three continuous phases. Starting with menses, proliferative and then the secretory phase. Normally menstruation occurs when blood levels of both female hormones decrease rapidly.
Would it be like erosion ? I am not sure if that is correct but i think it could be
