Definition

Noun: 1. A fundamental principle of Mendelian inheritance: The law of segregation states that during the formation of reproductive cells (gametes), the two alleles (variant forms) for a single gene separate, or segregate, so that each resulting gamete carries only one allele for that gene.

Usage

The term is used exclusively in the context of genetics and biological inheritance. * It describes a specific, observable process in meiosis, the cell division that produces gametes. * It explains how genetic variation is generated in offspring. * It is often stated as Mendel's First Law.

Examples

• Basic Explanation: Mendel's law of segregation explains why offspring inherit one allele from each parent for a given trait.
• In a Scientific Context: The law of segregation is demonstrated when homologous chromosomes, and thus the allele pairs they carry, separate during anaphase I of meiosis.
• Consequence: According to the law of segregation, a heterozygous parent (with one dominant and one recessive allele) will produce gametes, half of which carry the dominant allele and half the recessive allele.

Advanced Usage

• Foundation for Punnett Squares: The law of segregation is the biological principle that allows geneticists to use Punnett squares to predict the probability of genotypes in offspring.
• Contrast with Other Laws: The law of segregation deals with the separation of alleles for a trait, while the law of independent assortment deals with how alleles for traits are distributed.

Variants and Related Words

• Mendel's First Law: A direct synonym for the law of segregation.
• Segregation (Genetic context): The noun form describing the process itself (e.g., "the segregation of alleles").
• Segregate (Verb): The action described by the law (e.g., "alleles segregate during gamete formation").

Synonyms

• Mendel's First Law
• Principle of Segregation

Related Concepts (Not Synonyms)

• Allele: One of two or more versions of a gene.
• Gamete: A reproductive cell (sperm or egg).
• Meiosis: The type of cell division that produces gametes.
• Homozygous: Having two identical alleles for a gene.
• Heterozygous: Having two different alleles for a gene.
• Law of Independent Assortment: Mendel's Second Law.

Noun

1. members of a pair of homologous chromosomes separate during the formation of gametes and are distributed to different gametes so that every gamete receives only one member of the pair