3 Questions
How much of their alleles do identical twins share?
100%
How much of their alleles do siblings (including DZ twins) share on average?
50%
How many alleles do two distantly related members of a family typically share?
25%
Study Notes
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The more closely two individuals are related in a family, the more alleles they share in common.
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The most closely related two individuals in a family are identical twins, who share the same alleles at every locus.
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Siblings (including DZ twins) share 50% of their alleles with each other on average, but this is only on average.
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The more distantly related two members of a family are, the fewer alleles they share in common.
Test your knowledge of genetic relatedness within families, including the sharing of alleles between relatives such as siblings and twins. Understand the genetic implications of different family relationships.
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