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how to solve pedigree analysis ?

Asked by deepanshiaggarwal 24th February 2016, 6:58 PM
Answered by Expert
Answer:

Hi,

Different types of inheritance can be represented in pedigree analysis.

Autosomal dominant – Dominant traits located on any chromosome except on X or Y.

  • Autosomal dominant traits do not skip generations.
  • All individuals which are unshaded will be homozygous recessive.
  • All individuals which shaded will heterozygous or homozygous dominant.

Autosomal recessive - Recessive traits located on any chromosome except on X or Y.

  • Autosomal recessive can skip generations.
  • All individuals which are shaded will be homozygous recessive.
  • All individuals which unshaded will heterozygous or homozygous dominant.

X-linked recessive – Recessive traits located on X chromosome.

  • X-linked recessive traits can skip generations.
  • A male needs only one copy of gene (i.e. single X) to show the trait.
  • If mother has the trait, then all her sons will have the trait.
  • For daughters to show X-linked recessive trait, father should have the trait (here mother can be carrier or expressed the trait)

Answered by Expert 24th February 2016, 7:15 PM
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