A Level Biology Practice Exam

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What is a zygote?

The final stage of embryonic development
A type of mature seed
The initial diploid cell formed after fertilization
The process of cell division in embryos

The correct answer is: The initial diploid cell formed after fertilization

A zygote is defined as the initial diploid cell formed after fertilization occurs when a sperm cell merges with an egg cell. This single cell carries genetic material from both parents, resulting in a unique combination of DNA. The zygote undergoes numerous mitotic divisions as it develops into an embryo, marking the very beginning of the organism's development. This option accurately describes the zygote's role in the reproductive process, laying the groundwork for all subsequent developmental stages. Understanding the zygote is fundamental in biology, as it represents the first step toward forming a new organism.