| What is true about the isolated small tribal populations? |
| a) | There is a decline in population as boys marry girls only from their own tribe | b) | Hereditary diseases like colour blindness do not spread in the isolated population |
| c) | Wrestlers who develop strong body muscle in their life time pass this this character on to their progency | d) | There is no change in population size as they have a large gene pool |
| (b)As the isolated populations do not have any hereditary diseases like colourblindness, so, they do not spread accordingly. |