In a sectional view of the inner ear, which structure lies between a pair of perilymphatic chambers, which are interconnected at the tip of the cochlear spiral?

Cochlear duct.

Explanation:

The mammalian ear is divided into three parts- outer ear, middle ear and inner ear. Ear is an important organ of the body responsible for maintaining the body's equilibrium.

The cochlear duct is well known as scala media. The cochlear duct is present between the perilymphatic chambers. This duct is interconnected at tip of the cochlear spiral.

Thus, the answer is cochlear duct.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.