Populations of organisms fill well-defined places, or niches, in the ecosystem, utilizing their ability to reproduce.

The inbuilt tendency for variation during reproduction serves as the basis for evolution. The subtle differences in the surviving cells, caused by variations in DNA copies, contribute to the diversity and adaptation of organisms over time.

The presence of both X and Y chromosomes in the inheritance pattern adds diversity, allowing for the expression of various traits associated with these chromosomes. This diversity is particularly evident in determining the biological sex of offspring, where the combination ...

Half of the children are boys, and the other half are girls because the father can contribute either an X or a Y chromosome. The combination of the X received from the mother and either the X or Y from ...

The sex of offspring is determined by the inheritance of sex chromosomes from the parents. All children inherit an X chromosome from their mother. If a child inherits an X chromosome from the father, they will be a girl, and ...