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Reproduction and Inheritance
Quick questions on Sexual reproduction in humans: N(A)-Level Biology Reproduction and Inheritance
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are the sex cells?Show answer
Sexual reproduction needs two special sex cells, called gametes:
What is fertilisation?Show answer
Fertilisation is the joining (fusion) of the nucleus of a sperm with the nucleus of an egg, forming a single new cell called a zygote. In humans this normally happens inside the mother's body (internal fertilisation), in the oviduct (the tube leading to the uterus).
What is the role of the placenta?Show answer
The placenta is where the mother's blood comes close to the baby's blood (without mixing). Food and oxygen diffuse from the mother to the baby, and waste such as carbon dioxide diffuses from the baby to the mother. This is how the growing baby is fed and supplied with oxygen before it can breathe or eat for itself.
What is q1?Show answer
Name the male and female sex cells in humans. [1 mark]
What is q2?Show answer
Define fertilisation. [2 marks]
What is q3?Show answer
Explain how the placenta helps the developing baby. [2 marks]
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