Ch 07 - How do Organisms Reproduce?10th Science
Importance of DNA Copying in Reproduction
What is the most fundamental cellular event in reproduction, and why is the resulting offspring never an absolutely identical clone?
What is the most fundamental cellular event in reproduction, and why is the resulting offspring never an absolutely identical clone?
Blueprint Transfer: Reproduction fundamentally involves making copies of the blueprints of body design (DNA). DNA is the primary information source for protein synthesis; altered DNA leads to altered body designs.
Cellular Division: DNA copying is accompanied by the creation of an additional cellular apparatus, allowing the cell to physically divide.
The Boundary Condition: No biochemical reaction is absolutely reliable. Therefore, the copying process always introduces subtle variations (mutations) or errors, ensuring the offspring is similar but not perfectly identical.
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The Evolutionary Role of Variation
Why is biological variation highly beneficial to a species as a whole, even if it is not immediately necessary for the survival of a single individual?
Why is biological variation highly beneficial to a species as a whole, even if it is not immediately necessary for the survival of a single individual?
Populations of organisms fill well-defined places (niches) in the ecosystem. However, these niches can change drastically due to external environmental factors (e.g., global warming, asteroid impacts, disease).
If an entire population were perfectly genetically identical, a drastic environmental change could wipe out the entire species. Variations ensure that at least a few individuals randomly possess traits resistant to the new stress, allowing the species to survive and evolve over time.
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Binary Fission: Amoeba vs. Leishmania
How does the anatomical plane of cellular division in binary fission physically differ between Amoeba and Leishmania?
How does the anatomical plane of cellular division in binary fission physically differ between Amoeba and Leishmania?
Amoeba: Has a relatively simple and irregular body organization. The splitting of the two cells during division can take place in any plane.
Leishmania: (The pathogen causing Kala-azar) Has a more organized body structure featuring a whip-like flagellum at one end. Therefore, its binary fission must strictly occur in a definite orientation (longitudinal plane) in relation to this structure.
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Also in this chapter
30 more cards to study in Prism
- 4Multiple Fission in Plasmodium
- 5Pathogens and Fission Modes Summary
- 6Fragmentation and Multicellular Limits
- 7Regeneration in Simple Animals
- 8Asexual Budding: Hydra and Yeast
- 9Spore Formation in Rhizopus
- 10Natural Vegetative Propagation
- 11Benefits of Artificial Vegetative Propagation
- 12Tissue Culture (Micropropagation)
- 13The Evolutionary Imperative of Sexual Reproduction
- 14Meiosis and Chromosome Constancy
- 15Anatomical Disparities in Gametes
- 16Reproductive Anatomy of an Angiosperm Flower
- 17Unisexual vs. Bisexual Flowers
- 18Pollination vs. Fertilization in Plants
- 19The Pollen Tube Mechanism
- 20Post-Fertilization Morphological Changes
- 21Anatomy of a Plant Embryo (Seed)
- 22Puberty and Physiological Resource Allocation
- 23Anatomy and Function of the Testes
- 24Male Accessory Glands and Semen
- 25Anatomical Pathway of Sperm Ejaculation
- 26The Female Reproductive Pathway
- 27Menstruation and Menopause
- 28Developmental Stages: Zygote to Foetus
- 29Placental Anatomy and Function
- 30Primary Methods of Contraception
- 31Surgical Contraception: Vasectomy vs. Tubectomy
- 32Limitations of IUCDs Regarding STDs
- 33Female Foeticide and Population Stability
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