Question

the sex of a newborn individual in some species is largely determined genetically, while in other it is otherwise. give three different examples to justify this statement.

Answer 1

There are some other modes (non-genetic) of sex determination in some species. Example:
In some species of reptiles (such as alligators, turtles etc.), the sex-determination is temperature dependent. The temperature at which the egg is incubated during the temperature-sensitive period determines the sex of the baby.
In some species such, sex reversal occurs wherein the sex of the developing organism changes when they hatch out or develops into adults.
In some marine worms, the sex is determined by the physical contact between the larvae and female. If they mate with the female, they will become a male whereas if they do not mate, they will grow into females.

Answer 2

Answer:

The sex of newborn is determined genetically in most of the species as in humans. However in some other species the sex of the individual is determined by other means.

In some of the marine species the sex of an individual is determined by the physical contact between the female and the larva. If they mate with female they become male if not they become females.

In the turtle and alligator the sex of the newborn is determined by the temperature. The temperature at which the egg is incubated determines the sex of the species.