Human cells contain 23 pairs of chromosomes for a total of 46. There are 22 pairs of autosomes and one pair of sex chromosomes. The sex chromosomes are the X chromosome and the Y chromosome.Sex Chromosomes: In human sexual reproduction, two distinct gametes fuse to form a zygote.f an X sperm cell fertilizes an egg, the resulting zygote will be XX or female. If a sperm cell containing no sex chromosome fertilizes an egg, the resulting zygote will be XO or male. Sex Chromosomes Z-W: Birds, insects like butterflies, frogs and some species of fish have a different system for determining gender.
It is the abnormal leaking of blood backwards from the left ventricle, through the mitral valve, into the left atrium, when the left ventricle contracts, i.e. there is regurgitation of blood back into the left atrium. MI is the most common form of valvular heart disease.t is the abnormal leaking of blood backwards from the left ventricle, through the mitral valve, into the left atrium, when the left ventricle contracts, i.e. there is regurgitation of blood back into the left atrium. MI is the most common form of valvular heart disease.
About Mitral Valve Prolapse (MVP). Mitral (MI-tral) valve prolapse (MVP) is a condition in which the heart 's mitral valve doesn't work well. The flaps of the valve are floppy and don't close tightly. These flaps normally help seal or open the valve.Much of the time, MVP doesn't cause any problems.bout Mitral Valve Prolapse (MVP). Mitral (MI-tral) valve prolapse (MVP) is a condition in which the heart 's mitral valve doesn't work well. The flaps of the valve are floppy and don't close tightly. These flaps normally help seal or open the valve.