Explain why grandsons of boys who survived a famine lived longer than grandsons of boys who did not experience a
famine? What will be an ideal response?
ANSWER: There are many elements to consider in this question. One, famine is known to alter
methylation patterns which in turn alter gene expression. Two, methylation effects are
known to be passed to subsequent generations to some extent. Three, methylation patterns
are known to often be sex-limited. Thus, it appears the methylation pattern acquired by these
boys altered gene expression in a way that benefitted lifespan and was passed to male
descendants.
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A. prezygotic isolating mechanisms. B. hybrids. C. character displacement. D. polyploid individuals.
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When conditions are unfavorable, some bacteria form
A. galls. B. thylakoids. C. endospores. D. capsules. E. pili.