Pedigree 1

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Category: Education
     
 

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Symbols Normal Male Normal Female Affected Male Affected Female Normal marriage Sib- marriage

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Symbols Heterozygous male for Autosomal trait Carrier female Unidentified sex Abnormal phenotype Hterozygous female for autosomal trait Aborted Dead male Dead female

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Symbols Dizygotic male twins Dizygotic male female twins Dizygotic female twins Monozygotic male twins Monozygotic female twins

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Autosomal recessive trait Seen in same frequency in daughters and sons There is skip generatio n More frequently found in the children results by sibmating

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Autosomal Dominant trait Trait is seen in same frequency among both son and daughters Unaffected person does not transfer the trait Affected person requires atleast one affected parent

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X-linked recessive trait Affected male transfers the trait to daughter. Daughter is unaffected but carrier for trait Affected male does not transfer the trait to his son Carrier female transfers the trait more frequent to her son in comparision to daughters

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X-linked Dominant trait Affected male transfers the trait to all his daughters There is no skip generation Heterozygous affected female transfers the trait to half of her daughters and half of her sons

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Y-linked trait Trait only found in males Affected male transfers the trait to all sons

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Autosomal recessive trait Appears in both sexes with equal frequencies Trait tends to skip generations Seen more frequently among the children of consanguine marriage

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Autosomal Dominant trait Appears in both sexes with equal frequencies Unaffected individuals Do not transmit the trait Affected individuals Have atleast one affected parent

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X-linked recessive trait Affected male passes the trait to his daughters who are unaffected but carrier Affected male does not pass trait to his son Carrier femal e passes the trait to her son more frequently

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X-linked Dominant trait Affected males pass the trait to all the daughters Do not skip generations Affected heterozygous females pass the trait to half of the sons and half of the daughters

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Y-linked trait Affected males pass the trait to all the daughters Do not skip generations Affected heterozygous females pass the trait to half of the sons and half of the daughters

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