The substitution of one base for another base in DNA can have what effects on the phenotype? Why would you expect additions and deletions of bases to have a major effect on the phenotype?

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explanation:

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.