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ention DNA to your friends or relatives, and they probably won’t say, “What’s that?” We have become intimately familiar with our genes, using them to provide us with clues to our ancestry or gauge our risk of developing certain diseases. DNA sequencing is getting so cheap that some researchers foresee a time not far in the future when everyone will get their genome sequenced. But how much do you really know about genetics and how it affects our lives? Take this quiz to find out.

Mea culpa: An earlier version of this quiz incorrectly stated that only boys get color blindness. In fact, girls can get color blindness as well, although such cases are much more rare. According to the National Eye Institute, 0.5 percent of women with Northern European ancestry have the common form of red-green color blindness.

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  • Mutations in BRCA1 always increase the risk of cancer. The genetic variants that do not increase cancer risk are called polymorphisms. The term mutation is reserved only for pathogenic variants.

  • Tongue rolling is *not* a simple genetic trait; the answer set in this survey is incorrect (as the cited webpage states) and should be changed.

  • Yes sir I am not Geneticist. Am Studying Master degree in Genetics & Plant Breeding in Agriculture. I love Genetics more than me. I wanna enrich knowledge in Genetics especially Plant Genetics. I hope You will help me better than my expectations.

  • Girls can have X-linked color blindness if they inherit two X chromosomes that both carry the mutant allele. It is just more likely that boys will be affected because they inherit only one X chromosome; they do not inherit the second X that can provide the functional allele, masking the effect of the mutation.

  • This question is phrased rather poorly:
    “A recessive mutation only has an effect in which of the following situations”

    I assume that the two-hit hypothesis for tumor suppressors is still considered a possibility. Those may result from a single copy recessive mutation.

    • Tumor suppressors are inherited in dominant fashion, not recessive. Tumors may develop from a second hit, but only in that cell or clump of cells. It isn’t recessive on a whole organism scale – only at the cellular level.

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