Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

12. Meiosis

Introduction to Meiosis

General Biology

12. Meiosis

Introduction to Meiosis

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Multiple Choice

Why are gametes haploid after meiosis?

Because gametes do not undergo any cell division.

Because gametes lose chromosomes during fertilization.

Because mitosis duplicates the chromosome number in gametes.

Because meiosis reduces the chromosome number by half to ensure that fertilization restores the diploid state.

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Verified step by step guidance

Understand the concept of meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, producing haploid cells (gametes) from a diploid parent cell. This ensures genetic diversity and maintains the correct chromosome number across generations.

Recall the difference between diploid and haploid cells: Diploid cells contain two sets of chromosomes (one from each parent), while haploid cells contain only one set of chromosomes. Gametes (sperm and egg cells) are haploid to ensure that when they combine during fertilization, the resulting zygote is diploid.

Examine the stages of meiosis: Meiosis consists of two rounds of division, meiosis I and meiosis II. During meiosis I, homologous chromosomes are separated, reducing the chromosome number by half. Meiosis II separates sister chromatids, resulting in four haploid cells.

Understand the purpose of meiosis: The reduction in chromosome number during meiosis is crucial because it prevents the doubling of chromosomes in each generation. If gametes were diploid, fertilization would result in a zygote with twice the normal chromosome number.

Connect meiosis to fertilization: Meiosis ensures that gametes are haploid, so when fertilization occurs, the haploid sperm and egg combine to restore the diploid state in the zygote. This maintains the stability of the species' chromosome number.