RNAs are the direct products of genes, and these small RNAs can bind to other specific messenger RNA (mRNA) molecules and either increase or decrease their activity, for example by preventing an mRNA from producing a protein.
What causes stretch marks? Stretch marks are caused when the skin rapidly stretches as a result of sudden growth or weight gain. The stretching causes the middle layer of skin (dermis) to tear, allowing the deeper skin layers to show through, forming stretch marks. The dermis contains strong, inter-connected fibres that allow your skin to stretch as your body grows.
Submit. Â· just now. Report Abuse. no the stretch marks are caused by the stretching of the skin,enjoy that scratching,it wont do you or your baby any harm,my belly used to itch all the time in the later stages,its just a sign that your stomach is stretching.enjoy the rest of your pregnancy and hope all goes well :-). Source(s): mum of 4.