Tsar nicholas ii and tsarina alexandra were the romanov rulers of russia when the bolshevik revolution took place in 1917. during this revolution, tsar nicholas ii was overthrown, and the majority of his family members were killed. the remains of two of the tsar and tsarina’s children, alexei and anastasia, were never found. suppose two people came forward who claims to be the missing romanovs. which technology could only be used to identify alexei? dna technology str analysis mtdna analysis y-chromosome analysis

The correct answer is option D, Y -chromosome

Y chromosome analysis is the most suitable technique to analyses whether DNA of one male is linked to the other male. Since a male inherits a Y chromosome from his biological father, and a X chromosome from his biological mother, the Y chromosome can be assumed to be contributed by only the males in the hierarchal family. Thus in order to establish a relation between any two males, the best way is to establish a relationship between its Y chromosome hereditary line.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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