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Mendelian inheritance is gene-based and explains predictable trait patterns using dominant/recessive alleles and allele behavior during gamete formation.
Mendelian inheritance (also called Mendelism) is a type of biological inheritance based on the principles proposed by Gregor Mendel in 1865–1866. Its core idea is that inheritance is strongly tied to individual genes, with offspring traits determined by the alleles inherited from parents. Mendel’s work was later re-discovered in 1900 and became central to classical genetics, especially after being integrated with the chromosome theory of inheritance. Mendel’s key principles explain how alleles behave during reproduction: dominant alleles can mask recessive ones in heterozygotes, alleles separate during gamete formation (segregation), and alleles for different traits can be assorted independently when gametes are produced (independent assortment). These rules allow predictable genotype and phenotype ratios in offspring, often described using tools like Punnett squares and pedigrees. While many traits follow Mendelian patterns (single-locus, dominant/recessive alleles), Mendel also warned that not all traits are Mendelian; many show non-Mendelian inheritance due to factors like multiple genes, multiple alleles, or other complexities.
Mendelian inheritance is gene-based and explains predictable trait patterns using dominant/recessive alleles and allele behavior during gamete formation.
Mendel’s laws include dominance and uniformity, segregation of alleles, and independent assortment of different traits.
Mendelian patterns are most reliable for traits controlled by a single locus with two alleles, while many real traits are non-Mendelian due to additional genetic complexity.
A form of biological inheritance where traits follow Mendel’s principles of allele behavior, including dominance, segregation, and independent assortment.
An alternative form of a gene that can be inherited from a parent and contributes to an organism’s genotype.
An allele whose effect is expressed in the phenotype even when only one copy is present (in a heterozygote).
An allele whose effect is expressed in the phenotype only when two copies are present (in a homozygote).
During gamete formation, the alleles for a gene separate so each gamete carries only one allele for that gene.
Alleles for different genes segregate independently from each other during gamete formation, producing predictable combinations.
A trait whose inheritance follows Mendel’s principles, typically depending on a single locus with dominant and recessive alleles.
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