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 muscles in their life time pass this character on to their progeny
D) There is no change in1 population size as they have a large gene pool
Correct Answer: B
Solution :
Population can be defined as - a group or assemblage of organisms of the same species that live at a given time in a particular area. In human beings a dominant X-linked gene is necessary for formation of colour sensitive cells the cones, in the retina of eye. The recessive form of this gene is incapable of producing the colour sensitive cones and homozygous recessive female and hemizygous recessive males are unable to distinguish between these two colours. As the isolated population do not have any hereditary diseases like colourblindness, so, they do not spread accordingly. According to theory of inheritance of acquired characters of Lamarck the Wrestlers, who develop strong body muscles in their life time, must pass this character onto their progeny, but this is not found true. Gene pool is defined as the sum total of genes present in a Mendelian population. The study of gene pool tells us the total number of genes, their kinds and variety, present in the population.
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