Why do you think Huxley chooses to juxtaposition the description of the process of human fertilization in labs at the Bloomsbury Centre at the beginning of Chapter 10 with the scene between John and the sleeping Lenina at the end of Chapter 9?

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

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genetic variation will increase because of a new habitat and food source.

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i won't lie i don't know so go online and ask google thats what i do