Q76: On an average one centimorgans (cM) is equal to - Principles of Fish Genetics and Breeding - Fish Genetics and Breeding- ICAR JRF/SRF 2024 | Agrigyan

• Genetic vs Physical Map Distance:
• Centimorgan (cM) (or map unit) is a metric of genetic linkage defined as the distance between two chromosome loci that exhibits a $1\%$ recombination frequency during meiosis.
• In vertebrate genomes (including humans, zebrafish, and carps):

$$1\text{ cM} \approx 1\text{ Megabase (Mb)} = 1,000\text{ kilobases (kb)} = 1,000,000\text{ base pairs (bp)}$$

• Although the physical-to-genetic distance ratio fluctuates locally across hotspots and coldspots (centromeric heterochromatin), the widely accepted genome-wide average equivalent is $1\text{ cM} \approx 1000\text{ kb}$.
• nalysis:
• (1000kb): Correct average physical equivalent.

Correct option: (3) 1000kb