Sherpa

Existing user?

Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  6
Cycles within Ecosystems

The Role of Meiosis Flashcards

All 5 cards in this deck

What is the role of meiosis in the body, and where does it occur?: It produces gametes (sex cells); it occurs in the reproductive organs (testes and ovaries).
How many daughter cells does meiosis produce, and how do they compare genetically?: Four daughter cells, all genetically different from each other and from the parent cell.
How does the number of chromosomes in a gamete compare with the number in a body cell?: A gamete has half the number (it is haploid), e.g. 23 in a human gamete compared with 46 in a body cell.
True or false? Mitosis and meiosis both produce two genetically identical daughter cells.: False. Mitosis produces two genetically identical diploid cells; meiosis produces four genetically different haploid cells.
How do meiosis and fertilisation together lead to genetic variation in offspring?: Meiosis makes genetically different gametes, and fertilisation randomly combines one gamete from each parent, restoring the diploid number.