All female mammals have one active x chromosome per cell instead of two. what causes this? a) activation of the xist gene on the x chromosome that will become the barr bodyb) activation of the barr gene on one x chromosome, which then becomes inactivec) inactivation of the xist gene on the x chromosome derived from the male parentd) attachment of methyl (ch3) groups to the x chromosome that will remain active

The answer is; A

XIST RNA is a significant gene on the X chromosome (long (q) arm) that is involved in its inactivation in females, who have two X chromosomes. XIST RNA gene is activated in one of the X chromosomes, inactivating this chromosome and forming a Barr body.  

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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