Heredity

Heredity The male of many animals has one chromosome pair, the sex chromosomes, consisting of unequalised members called X and Y. At meiosis the X and Y chromosomes original pair, then disjoin and pass to different cells. One-half of the gametes organise contain the X and the other half the Y chromosome. The womanish has two X chromosomes, and all egg cells normally have a bun in the oven a single X. The eggs fertilized by X-bearing spermatozoa give females (XX), and those fertilized by Y-bearing spermatozoa give males (XY).

The genes located in the X chromosomes exhibit what is know as sex-linkage or crisscross inheritance. This is due to a pivotal difference between the paired sex chromosomes and the other pairs of chromosomes. The members of the somatic chromosome pairs are truly homologous; that is, each member of a pair contains a full complement of the same genes (albeit, perhaps, in different allelic forms). The sex chromosomes, on the other hand, do not constitute a homologous pair, as the X ch...If you want to get a full essay, order it on our website: Orderessay

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