Why is X-inactivation necessary in individuals with two X chromosomes?

Briefly describe the molecular processes that cause one X chromosome in each female cell to be active and the other X chromosome to be inactivated.

What role does reverse transcription play in chromosomal maintenance?  Give typing answer with explanation and conclusion

What is chromosome theory of inheritence?

The oncogenic protein BETA promotes entry into the S phase of the cell cycle. Phosphorylation of BETA at the amino acid Tyr98 causes BETA to be degraded by the proteasome, thus limiting its abundance. A mutation in the codon encoding Tyr98 changes this residue to Cys, which cannot be phosphorylated. What is the best description of this mutant allele?a) antimorphb) hypermorphc) hypomorphd) amorphe) neomorph