We start this reduction proess with a double set of chromosomes
(one from dad and one set from mom) and reduce it down to one
The double set consists of 23 pairs of homologous chromosomes,
or homologues,, one of each pair from one parent, the other from
the other parent.
The genes are arranged along both homologues in the same order
but carry different types of information---blue vs brown eyes
and so on.
In the context of chromosomes, "gene" is not used but
instead "locus" and "allele" are the correct
So what makes up the gene? Each allele is a packet
of information made of sugars, phosphates, nitrogen bases and