Which statement accurately describes how identification of individuals through the use of genetic engineering is possible?

a. the y chromosome doesn't experience crossing-over.
b. the x chromosome can only be passed from a father to his son.
c. the dna in mitochondria is passed from mother to child in the nucleus of a cell.
d. the mitochondria dna in a mother and her offspring vary greatly.

The answer is A. The Y chromosome doesn't experience crossing-over.

The crossover of chromosomes is the exchange of genetic material between homologous chromosomes. In males, X and Y chromosomes pairs but they cannot exchange genetic material except at the ends of the chromosomes called pseudoautosomal regions. So, greatly, the Y chromosome  doesn't experience crossing-over.

Through the process of elimination:
B. A mother gives X chromosome and a father gives Y chromosome to the son.
C. The mitochondria cannot be passed in the nucleus of a cell since it is another organelle.
D. It is thought that mitochondria is passed only from mother to her offspring, so they cannot vary greatly.

Very minute and important evidence needs to be collected in order together detail and figure out what had happened