Write true or false for the following statements:

In humans, there are two pairs of sex chromosomes.

According to the evolutionary theory, formation of a new species is generally due to:

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution, this means that:

Write true or false for the following statements:

In snails, individuals can change sex, indicating that sex is not genetically determined in them.

Write true or false for the following statements:

A child who inherits an X-chromosome form father will be a boy.