X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes; males have one X and one Y. Genes on the X chromosome can be recessive or dominant. Their expression in females and males is not the same. Genes on the Y chromosome do not exactly pair up with the genes on the X chromosome. X-linked recessive genes are ...
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Inheriting a disease, condition, or trait depends on the type of chromosome affected (non-sex or sex chromosome). It also depends on whether the trait is dominant or recessive. A single abnormal gene on one of the first 22 non-sex chromosomes from either parent can cause an autosomal disorder. For an example is, Huntington disease and neurofibromatosis type 1.
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Nondisjunction is the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei.
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Karyotype isthe number and visual appearance of the chromosomes in the cell nuclei of an organism or species.
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