Question

Explain linkage and recombination with example.

Hint:

Linkage keeps genes inherited together; recombination introduces new gene combinations through crossing over. % Topic - Principles of Inheritance

Answer 1

 

Linkage and Recombination

Linkage and recombination are important concepts in genetics that explain the inheritance of genes located on chromosomes.

Linkage

Linkage is the tendency of genes located close together on the same chromosome to be inherited together.

It was first observed by Thomas Morgan in fruit flies (Drosophila).

Example: Genes for body color and wing shape in fruit flies show linkage.

Recombination

Recombination is the exchange of genetic material between homologous chromosomes during meiosis, leading to new genetic combinations.

It increases genetic diversity and occurs due to crossing over in meiosis.

Example: Crossing over between maternal and paternal chromosomes results in new traits in offspring.

While linkage tends to keep genes together, recombination creates genetic variation, which is crucial for evolution and adaptation.