Asked by Nyakoang jal gatbel
4.Disorder of autosomal inheritance. 5.Disorder of sex-linked inheritance. . 6.Chromosomal disorder
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Here are concise definitions and common examples for each category:
4) Disorder of autosomal inheritance
- Definition: Caused by variants in genes on autosomes (non‑sex chromosomes). Can be autosomal dominant (AD) or autosomal recessive (AR).
- Autosomal dominant (one mutant allele sufficient): examples — Huntington disease, Marfan syndrome, achondroplasia. Typical pattern: affected person in every generation; 50% risk to each child of an affected heterozygote.
- Autosomal recessive (two mutant alleles required): examples — cystic fibrosis, sickle cell disease, Tay‑Sachs disease. Typical pattern: parents often asymptomatic carriers; 25% risk to each child if both parents are carriers.
5) Disorder of sex‑linked inheritance
- Definition: Caused by variants on sex chromosomes (usually X chromosome). Patterns differ for X‑linked recessive, X‑linked dominant, and rarely Y‑linked.
- X‑linked recessive: examples — hemophilia A, Duchenne muscular dystrophy, red‑green color blindness. Typical pattern: affected males (hemizygous) more common; carrier mothers transmit to ~50% of sons (affected) and ~50% of daughters (carriers).
- X‑linked dominant: examples — Rett syndrome, some cases of fragile X-related disorders (variable). Pattern: affected females more common/severe variability; affected males often more severely affected or lethal in utero depending on disorder.
- Y‑linked: rare, e.g., some forms of male infertility; transmitted father → all sons.
6) Chromosomal disorder
- Definition: Caused by abnormalities in chromosome number or structure (aneuploidy, deletions, duplications, translocations, inversions).
- Examples: Down syndrome (Trisomy 21) — nondisjunction leading to an extra chromosome 21; Turner syndrome (45,X) — monosomy X; Klinefelter syndrome (47,XXY); Cri‑du‑chat syndrome — deletion of 5p; Patau (Trisomy 13) and Edwards (Trisomy 18).
- Typical causes: meiotic nondisjunction, unbalanced translocations, or structural rearrangements; clinical features depend on which chromosome and region are affected.
If you want, I can list one clear example per line for a worksheet, or expand clinical features and inheritance risks for any specific disorder.
4) Disorder of autosomal inheritance
- Definition: Caused by variants in genes on autosomes (non‑sex chromosomes). Can be autosomal dominant (AD) or autosomal recessive (AR).
- Autosomal dominant (one mutant allele sufficient): examples — Huntington disease, Marfan syndrome, achondroplasia. Typical pattern: affected person in every generation; 50% risk to each child of an affected heterozygote.
- Autosomal recessive (two mutant alleles required): examples — cystic fibrosis, sickle cell disease, Tay‑Sachs disease. Typical pattern: parents often asymptomatic carriers; 25% risk to each child if both parents are carriers.
5) Disorder of sex‑linked inheritance
- Definition: Caused by variants on sex chromosomes (usually X chromosome). Patterns differ for X‑linked recessive, X‑linked dominant, and rarely Y‑linked.
- X‑linked recessive: examples — hemophilia A, Duchenne muscular dystrophy, red‑green color blindness. Typical pattern: affected males (hemizygous) more common; carrier mothers transmit to ~50% of sons (affected) and ~50% of daughters (carriers).
- X‑linked dominant: examples — Rett syndrome, some cases of fragile X-related disorders (variable). Pattern: affected females more common/severe variability; affected males often more severely affected or lethal in utero depending on disorder.
- Y‑linked: rare, e.g., some forms of male infertility; transmitted father → all sons.
6) Chromosomal disorder
- Definition: Caused by abnormalities in chromosome number or structure (aneuploidy, deletions, duplications, translocations, inversions).
- Examples: Down syndrome (Trisomy 21) — nondisjunction leading to an extra chromosome 21; Turner syndrome (45,X) — monosomy X; Klinefelter syndrome (47,XXY); Cri‑du‑chat syndrome — deletion of 5p; Patau (Trisomy 13) and Edwards (Trisomy 18).
- Typical causes: meiotic nondisjunction, unbalanced translocations, or structural rearrangements; clinical features depend on which chromosome and region are affected.
If you want, I can list one clear example per line for a worksheet, or expand clinical features and inheritance risks for any specific disorder.
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