X-linked, autosomal dominant, and recessive are the three general rules for genes that follow a mendelian pattern of inheritance
- When two alleles of a single gene, one of which may be entirely dominant over the other, are present, simple (or Mendelian) inheritance refers to the transmission of features that are governed by that gene. Whether simple features are governed by genes on autosomes or by genes on sex chromosomes determines the pattern of inheritance.
- The laws of dominance, segregation, and independent assortment are among Mendel's laws of inheritance. According to the law of segregation, each person has two alleles, but only one of them is passed on to the next generation.
- Three basic principles define mendelian inheritance: Genes are passed down from generation to generation unchanged, with the exception of exceptional cases; each gene follows Mendel's law.
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