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Year 8 - Science

Gametes and fertilisation in sexual reproduction

Reproduction in humans

Unit Summary

This unit explores human reproduction, covering the structure and function of male and female reproductive systems, the menstrual cycle, gametes, fertilisation, gestation, and birth. It also examines how maternal lifestyle impacts the foetus through the placenta.

Lesson Summary

You will learn to describe the role of gametes and fertilisation in sexual reproduction.

Key Notes

  • Sperm and egg cells are the sex cells of humans and are called gametes.
  • Humans reproduce through sexual reproduction where half the genetic material of the offspring comes from each parent.
  • Fertilisation occurs in the fallopian tubes when gametes join to form a zygote.
  • Each gamete carries half the genetic material of the parent; a zygote has a full set of genetic material.
  • The zygote divides to form a ball of cells called an embryo, which grows to form a foetus and then a baby.

Vocabulary To Learn

  • gametes: The sex cells in humans, which are egg and sperm cells.
  • sperm cell: The male gamete.
  • egg cell: The female gamete.
  • fertilisation: Occurs when a sperm and egg cell fuse together to form a zygote.
  • embryo: Formed when a zygote divides to form a ball of cells.

Common Mistakes To Avoid

  • Fertilisation occurs in the uterus and can happen at any time.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Sperm and egg cells are the sex cells of humans and are called gametes. Humans reproduce through sexual reproduction where half the genetic material of the offspring comes from each parent.

2. Define this scientific word and use it in context. 'gametes'

The sex cells in humans, which are egg and sperm cells. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Fertilisation occurs in the uterus and can happen at any time. Correction: Fertilisation occurs in the fallopian tubes and this can only happen before the egg cell reaches the uterus.

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