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

Meiosis I

General Biology

12. Meiosis

Meiosis I

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2:36 minutes

Problem 6c

Textbook Question

The following diagram shows a cell in meiosis. Identify the stage of meiosis shown.

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Observe the diagram: It shows two homologous chromosomes, each consisting of two sister chromatids, aligning closely together.

Notice the exchange of genetic material between the chromatids of homologous chromosomes, which is indicative of crossing over.

Crossing over occurs during the prophase I stage of meiosis, where homologous chromosomes pair up and exchange segments.

The presence of chiasmata, the points where crossing over occurs, is a key feature of prophase I.

Conclude that the stage of meiosis shown in the diagram is prophase I, characterized by synapsis and crossing over.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Meiosis

Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells. It consists of two consecutive divisions: meiosis I and meiosis II. This process is crucial for sexual reproduction, as it ensures genetic diversity through recombination and independent assortment of chromosomes.

Crossing Over

Crossing over is a process during prophase I of meiosis where homologous chromosomes exchange genetic material. This occurs at points called chiasmata and results in new combinations of alleles, contributing to genetic variation in gametes. The image shows chromosomes undergoing crossing over, indicating the stage is prophase I.

Homologous Chromosomes

Homologous chromosomes are pairs of chromosomes, one from each parent, that are similar in shape, size, and genetic content. During meiosis, these pairs align and can undergo crossing over, as seen in the image. Understanding their behavior is essential for identifying stages of meiosis and the genetic outcomes of cell division.

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Related Videos

Related Practice

Multiple Choice

Synapsis occurs during __________.

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Multiple Choice

The synaptonemal complex __________.

The two homologs of a pair move toward opposite poles of the dividing cell during

a. Mitosis

b. Meiosis I

c. Meiosis II

d. Fertilization

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Textbook Question

If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I will be

a. 0.25x

b. 0.5x

c. x

d. 2x

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Textbook Question

The diagram shows a cell in meiosis. Describe the makeup of a haploid set and a diploid set.

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Textbook Question

The diagram shows a cell in meiosis. Label the appropriate structures with these terms: chromosome (label as duplicated or unduplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair (use a bracket when labeling), homolog (label each one), chiasma, sister chromatid cohesion, and gene loci, labeling the alleles of the F and H genes.

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Textbook Question

After telophase I of meiosis, each daughter cell is ________.

a. Diploid, and the chromosomes are composed of one double-stranded DNA molecule.

b. Diploid, and the chromosomes are composed of two sister chromatids.

c. Haploid, and the chromosomes are composed of one double-stranded DNA molecule.

d. Haploid, and the chromosomes are composed of two sister chromatids.

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Multiple Choice

How does Anaphase II differ from Anaphase I in meiosis?