2. What are the homologous
and the heterologous portions
of the human sex
chromosomes?

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Homologous portion is that which
there are genes alleles in both Y
X sex chromosomes. The
portions are situated more
the central part of sex
chromosomes, near the .
Heterologous portion is that
genes do not have alleles
in the other chromosome. These
genes are more in the peripheral
of the arms of Yand X
chromosomes.