Match the following columns:

Column I	Column II
a. Telomeres	1. Complete linkage
b. Genes located in different chromosome	2. Fruit fly
c. Gene closely located in chromosomes	3. Chromosome ends
d. Four linkage groups	4. Unlinked gene

a. Telomeres is the point or region at the end of the chromosome. Telomeres protect the ends of chromosomes from becoming frayed or tangled. Each time a cell divides, the telomeres become slightly shorter.
b. Gene located in a different chromosome is unlinked gene. Unlinked genes may be on different chromosomes, or so far apart on the same chromosome that they are often separated by recombination.
c. Gene closely located in chromosomes leads to complete linkage. It linkage between genes that are located close together on the same chromosome with no crossing over between them.
d. Four linkage groups are present in Fruit fly. In fruit fly, there are four pair of chromosomes: three are autosomal pairs and one pair of sex chromosomes. Genes present on one chromosome form a linkage group.