Answer
As gene is to needle.
Step-by-step explanation
There is a direct relationship as a gene is a part of a chromosome. Every chromosome contains many genes with each gene coding for a specific protein. A chromosome is a long strand of DNA and genes are arranged in a single series along a chromosome. Genes are present in the chromosomes and work as functional units of chromosomes. Genes are responsible for cell function and play a very important role as genes are segments of DNA.