Asked by Marggie
Which TWO events are caused by differences in gene expression?
• An Arctics hare’s fur changes from white to brown daring the summer months.
• Albino organiams are completely unable to prodece melanin.
• During embryonic development, identical cells differentiate into skin cells, muscle cells, nerve cells, etc.
• Cancer cells skip important cell cycle checkpoints, causing unregulated cell division.
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Answers:
- Arctic hare’s fur changes from white to brown during the summer months.
- During embryonic development, identical cells differentiate into skin, muscle, nerve cells, etc.
Reason: Both are caused by differential gene expression (different genes turned on/off in different conditions or cell types). Albino organisms and cancer usually result from mutations that alter gene function (or in some cancers, from mutations that change expression), so they are not examples of normal differences in gene expression.
- Arctic hare’s fur changes from white to brown during the summer months.
- During embryonic development, identical cells differentiate into skin, muscle, nerve cells, etc.
Reason: Both are caused by differential gene expression (different genes turned on/off in different conditions or cell types). Albino organisms and cancer usually result from mutations that alter gene function (or in some cancers, from mutations that change expression), so they are not examples of normal differences in gene expression.
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