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. What is the primary structural form of DNA that allows it to store genetic information efficiently?
3. Which of the following is a major component of the nervous system?
Genetics — molecule storing info?
DNA carries genetic information.
DNA — definition?
Genetic material in nucleus, double helix.
Nervous System — role?
Transmits signals for body coordination.
Gene — role?
Codes for specific traits or proteins.
Immunity — defense mechanism?
Protects against pathogens and infections.
Chromosome — structure?
Condensed DNA during cell division.
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