NEET BIOLOGY

Detailed explanation-1: -From this, people often jump to the conclusion that the dominant trait is also the most common one. This isn’t always the case and there is no reason it should be. Whether or not a trait is common has to do with how many copies of that gene version (or allele) are in the population.

Detailed explanation-2: -False; Dominant alleles are not always more common in the population than recessive alleles.

Detailed explanation-3: -As you’ve noticed, dominant does not mean common. Dominant just means that it’ll win out over recessive. How common a trait is has nothing to do with this. It depends on how many copies of that gene version are in a population.

Detailed explanation-4: -Dominant traits are also not necessarily more common than recessive traits; although, if they have an effect on the health of individuals within a population, they may become more or less common in the gene pool over time, due to natural selection.

Detailed explanation-5: -Dominant alleles show their effect even if the individual only has one copy of the allele (also known as being heterozygous?). For example, the allele for brown eyes is dominant, therefore you only need one copy of the ‘brown eye’ allele to have brown eyes (although, with two copies you will still have brown eyes).