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  2. Sex linkage - Wikipedia

    en.wikipedia.org/wiki/Sex_linkage

    Sex linked describes the sex-specific reading patterns of inheritance and presentation when a gene mutation is present on a sex chromosome (allosome) rather than a non-sex chromosome . In humans, these are termed X-linked recessive, X-linked dominant and Y-linked. The inheritance and presentation of all three differ depending on the sex of both ...

  3. X-linked recessive inheritance - Wikipedia

    en.wikipedia.org/wiki/X-linked_recessive_inheritance

    X-linked recessive inheritance. X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be always expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation (see zygosity).

  4. Heredity - Wikipedia

    en.wikipedia.org/wiki/Heredity

    An example pedigree chart of an autosomal dominant disorder An example pedigree chart of an autosomal recessive disorder An example pedigree chart of a sex-linked disorder (The gene is on the X chromosome.) The description of a mode of biological inheritance consists of three main categories: 1. Number of involved loci

  5. Y linkage - Wikipedia

    en.wikipedia.org/wiki/Y_linkage

    Y-linked inheritance Pedigree tree showing the inheritance of a Y-linked trait. Y linkage, also known as holandric inheritance (from Ancient Greek ὅλος hólos, "whole" + ἀνδρός andrós, "male"), [1] describes traits that are produced by genes located on the Y chromosome. It is a form of sex linkage. Y linkage can be difficult to detect.

  6. Pseudodominance - Wikipedia

    en.wikipedia.org/wiki/Pseudodominance

    The pattern of inheritance in which a single recessive allele is inherited but is still expressed is known as pseudodominance. This mainly occurs with sex-linked genes (i.e., those on the sex chromosomes). The homogametic sex (females in humans) receive two of each sex chromosome and therefore need to be homozygous to show a recessive trait.

  7. Reciprocal cross - Wikipedia

    en.wikipedia.org/wiki/Reciprocal_cross

    Sex linkage was first reported by Doncaster and Raynor in 1906 [2] who studied the inheritance of a colour mutation in a moth, Abraxas grossulariata. Thomas Hunt Morgan later showed that a new white-eye mutation in Drosophila melanogaster was also sex-linked. He found that a white-eyed male crossed with a red-eyed female produced only red-eyed ...

  8. Gene mapping - Wikipedia

    en.wikipedia.org/wiki/Gene_mapping

    There are two distinctive mapping approaches used in the field of genome mapping: genetic maps (also known as linkage maps) [7] and physical maps. [3] While both maps are a collection of genetic markers and gene loci, [8] genetic maps' distances are based on the genetic linkage information, while physical maps use actual physical distances usually measured in number of base pairs.

  9. Sex-limited genes - Wikipedia

    en.wikipedia.org/wiki/Sex-limited_genes

    Sex-limited genes are also distinguished from sex-influenced genes, where the same gene will show differential expression in each sex. Sex-influenced genes commonly show a dominant/recessive relationship, where the same gene will have a dominant effect in one sex and a recessive effect in the other (for example, male pattern baldness).