Since the haploid cells of a kangaroo contain 8 chromosomes, the number of chromosomes in the kangaroo's diploid cells are 16.
A chromosome is a linear arrangement of condensed DNA and associated proteins called histones, which contains the genetic material (genome) of an organism.
Diploidy of a cell means having a pair of each type of chromosome, one of the pair being derived from the ovum and the other from the spermatozoon.
On the other hand, a haploid cell contains only one set of chromosome (n). This means that diploid is * 2 of haploid = 2n.
Therefore, if the haploid cells of a kangaroo contain 8 chromosomes, the number of chromosomes in the kangaroo's diploid cells are 8 × 2 = 16.
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