In GCSE Science students will look at genetic variation and its control. This is the second of four quizzes on that topic and it looks in particular at sexual and asexual reproduction.
Reproduction can be either asexual or sexual. Plants can reproduce asexually, as can simple single celled organisms like bacteria and protozoa. Most animals and plants reproduce sexually which creates variation in populations. This variation can lead to natural selection and therefore evolution of a species.
Asexual reproduction in single celled organisms takes the form of budding or binary fission. In plants, it can be carried out artificially by taking cuttings or tissue culture and happens naturally by runners and rhizomes. Asexual reproduction gives rise to offspring that are genetically identical to each other and the parent.
Sexual reproduction requires that two sex cells merge to form a new cell. The technical name for any sex cell is 'gamete' and the new cell they form is called a zygote. These are useful words to remember as they appear often in questions about sexual reproduction. An animal zygote is implanted in the lining of the uterus where it develops to become a new individual. Fertilisation can be carried out artificially in a process called in vitro fertilisation.
In animals, the male gamete is sperm and the female gamete is the egg. When the sperm penetrates the egg, the egg is said to have been fertilised. The gametes of plants are the pollen and the ovule. A fertilised ovule becomes a seed.
You can play all the teacher-written quizzes on our site for just £9.95 per month. Click the button to sign up or read more.
This quiz is for members only, but you can play our Biology - Healthy Diet (AQA Syllabus A) quiz to see how our quizzes work.
If you're already a subscriber, you can log in here
Or take a look at all of our GCSE Science quizzes.
Or if you're ready to take the plunge, you can sign up here.