Sequence of both mt DNA and Y chromosomes are considered for the study of human evolution because they are uniparental in origin. mtDNA is inherited along with the maternal cytoplasm and Y chromosome is inherited from father. So they do not take part in recombination. In addition, mtDNA has a higher mutation rate then nuclear DNA so that it is more useful for short term evolutionary studies. Related Theory The Ychromosomeisinheritedfromthefather; therefore, paternal social class was included in the Y chromosome analysis. Mitochondrial DNA is inherited from the mother; thus, maternal social class was included in the analysis along with paternal social class for mitochondrial DNA. More than 27% of the variance in Y-haplogroups can be attributed to differences between populations, whereas mtDNA showed much lower heterogeneity between populations (less than 5%), suggesting a strong influence of patrilocal social structure.