why do all cells in human body have sex chromosomes?
I mean Sex chromosomes in sperm and egg cell is necessary . But why in all cells? All the remaining cells don't undergo sexual reproduction then why?
Please Explain
Answers
The biological differences between the sexes have long been recognized at the biochemical and cellular levels. Rapid advances in molecular biology have revealed the genetic and molecular bases of a number of sex-based differences in health and human disease, some of which are attributed to sexual genotype—XX in the female and XY in the male. Genes on the sex chromosomes can be expressed differently between males and females because of the presence of either single or double copies of the gene and because of the phenomena of different meiotic effects, X inactivation, and genetic imprinting. The inheritance of either a male or a female genotype is further influenced by the source (maternal or paternal) of the X chromosome. The relative roles of the sex chromosome genes and their expression explains X-chromosome-linked disease and is likely to illuminate the reasons for heterogeneous expression of some diseases within and between the sexes.
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