Select the correct statement(s) about sex determination in animals.

Question

Select all that apply.

In all animals, males are XY and females are XX.
The mechanism of sex determination varies with different animal species.
In all animals, males have the SRY gene and females lack this gene.

Answer 1

The correct statement(s) about sex determination in animals are:

• The mechanism of sex determination varies with different animal species.

The other statements are incorrect:

• In many species, such as mammals, males are XY and females are XX, but this is not true for all animals. Many animals have different mechanisms of sex determination (e.g., ZW/ZZ system in birds, environmental factors in reptiles).

• The SRY gene is present in males of certain species (like most mammals) and is critical for male sex determination; however, not all animal species have this gene, and some species have different pathways for sex determination altogether.