Taxonomic Classification and Evolution of Primates
Taxonomic Classification
Kingdom: Animalia (covered by cells possessing a cytoplasmic membrane, centrioles, and movement).
Phylum: Chordata (chordates, presenting a notochord and pharyngeal gill slits).
Class: Mammalia (milk glands, bodies covered with hair, temperature regulation).
Order: Primates.
Family: Hominidae (larger brains than other species, eyes in a frontal position, flat fingernails allowing better handling).
Genus: Homo.
Species: Sapiens.
Subphylum: Vertebrata (notochord that becomes a backbone)
Read MoreInheritance and Genetics: Key Concepts in Biology
Mendel’s Laws of Inheritance
For his experiments on inheritance, Gregor Mendel chose the common pea plant. His findings laid the foundation for modern genetics.
- Mendel’s First Law (Law of Segregation): When crossing two varieties of plants or animals that differ in one character, all the first-generation hybrids exhibit the dominant character. The recessive character reappears in the second generation.
- Mendel’s Second Law (Law of Independent Assortment): When crossing two varieties of plants that differ
Organ Donation, Transplants, and Stem Cell Therapies
Who Can Be a Donor?
A donor is typically a person in a state of brain death, where brain function has ceased, but the heartbeat is artificially maintained to keep organs viable for transplantation. In some cases, a living person can be a donor, particularly for tissues or renewable organs.
Spanish Legislation Regarding Organ Donation:
- Establishment of brain death by medical professionals.
- Respect for the deceased’s wishes regarding organ donation.
- Diagnosis of death must be made by physicians.
- Donation
Reproductive Biology: Mutations, Gametes, and Fertilization
Reproductive Biology: Key Concepts
Mutation: An alteration in the genetic information (genotype) of a living being, causing a change in its pattern. This change occurs suddenly and spontaneously and can be inherited by offspring.
Ovules: These are the female sex cells, large, spherical, and motionless. From puberty, an egg matures in one of the ovaries every 28 days and travels through a fallopian tube.
Sperm: The male sexual reproductive cell or gamete, responsible for fertilizing the egg and providing
Read MoreMineral Salts: Functions, Osmosis, and Trace Elements
Mineral Salts: Composition and Function
Mineral salts are dissociated into ions (anions and cations) and are part of the intracellular and extracellular media.
Functions of Dissolved Salts
- Regulation of salinity: Ion concentrations vary across cellular compartments and must be regulated.
- Regulation of electric membrane potential.
- Regulation of enzymatic activity: Enzymes require specific conditions to function.
- Adjustment of pH: pH is a parameter dependent on biological activity within the cell.
- Regulation
Understanding Diseases: Tumors, Infections, and Health Issues
Understanding Tumors and Their Impact
Tumor: A disorganized mass of bone tissue. Tumors can be benign (localized) or malignant (cancerous), with the latter capable of invasiveness, spreading to other tissues.
Metastasis: The occurrence of new tumors in different parts of the body, often through the bloodstream.
Pharmacology and Adverse Reactions
Adverse Reactions: Undesired secondary reactions to medications.
Dose: The amount of medication needed to achieve the desired effect without causing significant
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