A geneticist studies a series of characteristics in monozygotic twins and dizygo

Question

A geneticist studies a series of characteristics in monozygotic twins and dizygotic twins, obtain the following concordances. Based upon the data above. Trait A is determined by _. genetic factors only environmental factors only both genetic and environmental factors cannot he determined It a combination of genetic and environmental factors determines a particular human trail, one should observe which of the following from twin studies? A some concordance between dizygotic twins and a lower concordance between monozygotic twins some concordance between monozygotic twins and a lower concordance between dizygotic twins a similarly low or high concordance between both monozygotic and dizygotic twins 100% concordance between dizygotic twins and no concordance between monozygotic twins None of the above What is the most likely mode of inheritance for the pedigree shown above? autosomal dominant autosomal recessive X-linked dominant X -linked recessive Y-linked

Explanation / Answer

21 C both genetic and environmental factors

If trait was determined only by genetic factor then concordance in monozygotic MZ twins would have been more than dizygotic twins.since both genetic and environmental factors are involved, so concordance is higher in DZ.

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