Page 2: Fertilization - The Union of Gametes
Fertilization is the process where two gametes combine to form a new organism. This page explains how fertilization restores the full chromosome count and initiates embryo development.
During fertilization, a male gamete (sperm) with 23 single chromosomes fuses with a female gamete (egg) also containing 23 single chromosomes. This union results in a cell with the full complement of 46 chromosomes (23 pairs), restoring the normal chromosome number for the species.
Highlight: In meiosis, the number of chromosomes is halved, but in fertilisation, the full number is restored.
After fertilization, the resulting cell begins to divide through mitosis, forming a cluster of identical cells called an embryo. This process marks the beginning of a new organism's development.
Vocabulary: An embryo is a cluster of identical cells formed by the mitotic division of the fertilized egg.
Understanding the relationship between meiosis and fertilization is crucial for grasping the concepts of genetic inheritance and the continuation of species.
Example: If a sperm cell with 23 chromosomes fertilizes an egg cell with 23 chromosomes, the resulting embryo will have 46 chromosomes, the normal number for humans.
This knowledge is essential for students studying GCSE biology meiosis and fertilisation revision questions and answers. It's particularly important to understand the differences between meiosis vs mitosis GCSE and to be able to interpret a meiosis gcse diagram.
Definition: Fertilization is the process by which two gametes (each with half the normal chromosome number) combine to form a zygote with the full chromosome complement, initiating the development of a new organism.
