One of the fundamental rules of inheritance states that different alleles (gene copies) of a trait, such as sex, are inherited with equal frequency. "However, we have long known that there are genes ...

Animal reproduction encompasses the full sequence from gamete formation through fertilisation, embryonic development and parturition. In farm and companion species alike, natural breeding is ...

This is read by an automated voice. Please report any issues or inconsistencies here. Antarctic penguins are breeding nearly two weeks earlier than a decade ago — the fastest shift in breeding timing ...