Question

Which of the following is NOT a prerequisite for evolution occurring?

Answer choices:

A) Different forms of the trait confer different levels of adaptive benefits

B) Variation in a trait must be heritable within a population

C) More individuals are born into the population than can survive

D) There must be variation within a trait in a population

E) One form of the trait must be dominant to the other form

Answer 1

The incorrect option is E) One form of the trait must be dominant to the other form.

Some traits showing incomplete dominance or codominance can also take part in evolution and may be more beneficial than other trait.

For example- In Africa, person heterozygous for sickle cell anemia are better suited in the environment as it protect them from malaria.

The homozygous recessive genotype for sickle cell anemia can not survive till adult.

The homozygous normal genotype may suffer from malaria.

However, sickle cell anemia show incomplete dominance inheritance pattern.