Question

What is linkage?

Answer 1

Linkage:

1. In linkage, two or more genes linked together are always inherited together in the same combination for more than two generations.
2. The linkage is inversely linked to the distance between genes in the genome.

Types of linkage :

1. Complete linkage:

1. In this type of linkage, genes located on the same chromosome do not separate and are inherited together from parents to offsprings due to no crossing over.
2. It permits the inheritance of combined of parental characteristics.
3. It is commonly observed in genes for long wings and grey body in male Drosophila.

2. Incomplete linkage:

1. It is displayed by genes that generate some portion of non-parental combinations.
2. These genes are situated at a distance on the chromosomes which can be attributed to the occasional or accidental deconstruction of chromosomal segments while crossing over.