THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Identical twin sisters both have the gene for freckles. One twin (Mary) spent the summer at an outdoor sports camp and the other twin (Rory) spent the summer at a science camp which was mostly indoors. Mary has more freckles than Rory at the end of the summer. What is the best explanation?
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Mary has a stronger freckle gene than Rory
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The twins have two different genes for freckles
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Having freckles is not an inherited trait
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The environment affected the expression of the gene that controls for freckles
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Explanation:
Detailed explanation-1: -To form a fetus, an egg from the mother and sperm from the father come together. The egg and sperm each have one half of a set of chromosomes. The egg and sperm together give the baby the full set of chromosomes. So, half the baby’s DNA comes from the mother and half comes from the father.
Detailed explanation-2: -Based on this concept, gene–environment interaction can be defined as “a different effect of an environmental exposure on disease risk in persons with different genotypes, ” or, equivalently, “a different effect of a genotype on disease risk in persons with different environmental exposures.”
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