Chromosomes

Chromosomes         Most electric cells have a nucleus with a definite number of chromosomes.         There argon twenty-three different bitstocks of chromosomes in military man cells.         In females, to each one chromosome in the twenty-three pairs, pops to be identical to its partner.         In males, one pair is different, one chromosome is shorter than its partner. These cardinal chromosomes are the shake chromosomes.         In females both the sex chromosomes are the same length.         We use an X to confront the longer sex chromosome and a Y to represent the shorter one. fertilization A woman has devil X chromosomes, XX, while a man has one of each, XY. The twain Xs or the X and Y are separated from each other during meiosis - the cell divisions that form sex cells or gametes. All healthy nut produced by a human ovary have an X chromosome. However, with sperm, half(pre nominal) carry an X and half carry a Y. A human pampers gender is unconquerable when an egg X is fertilised by a sperm. The baby volition be a daughter if the sperm is an X sperm. The baby will be a boy if the sperm is a Y sperm. Chance is convolute in gender. For example, a family with 4 children will not inescapably include two boys and two girls.

Its a bit like go aroundning a coin. The family is as likely to have two of each as it is to pop two heads and two tails in four spins of a coin. If you were to spin a coin, millions of times, you get more(prenominal) or less equal total of heads and tails. The some(prenominal) millions of fertilisations that made the community of the world tend to produce roughly equal n! umbers of boys and girls.         22 of the 23 pairs of chromosomes in human body cells appear to be... If you want to get a skillful essay, order it on our website: OrderEssay.net

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