DNA (Deoxyribonucleic Acid): Molecule containing genetic information in the nucleus of cells, structured as a double helix.
Example: Human DNA carries instructions for building proteins.
Gene: Segment of DNA that determines a specific hereditary trait, such as eye color.
Example: The gene for blue eyes.
Chromosome: Structure formed by condensed DNA, visible during cell division; humans have 23 pairs.
Example: During mitosis, chromosomes are visible under a microscope.
Heredity: Transmission of traits from parents to offspring through genes, involving alleles (different versions of a gene).
Example: Passing on brown hair.
Mutation: Change in the DNA sequence, which can introduce genetic diversity or cause genetic disorders.
Example: A mutation leading to sickle cell anemia.
DNA Structure & Function: DNA's double helix structure allows it to store genetic information efficiently. Genes are specific sequences within DNA that code for proteins.
Genetic Inheritance: Traits are inherited via alleles; dominant and recessive alleles influence trait expression. Offspring inherit one allele from each parent.
1. What is DNA in the context of genetics?
2. Which of the following is a major component of the nervous system?
3. What is the primary role of immunity in the human body?
Genetics — molecule storing info?
DNA carries genetic information.
Nervous System — role?
Transmits signals for body coordination.
Immunity — defense mechanism?
Protects against pathogens and infections.
DNA — definition?
Genetic material in nucleus, double helix.
Gene — role?
Codes for specific traits or proteins.
Chromosome — structure?
Condensed DNA during cell division.
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