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Phenotypic ratio of the offspring

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Question 1: The gene for yellow body color (b) in fruit flies is X-linked recessive. Its dominant allele (B) produces normal body color. What is the phenotypic ratio of the offspring that results from a cross between:

  • a yellow male and yellow female?
  • a yellow female and normal colored male?
  • a homozygous normal female and yellow male?
  • a normal heterozygous female and normal male?

Question 2: A form of hemophilia in humans is caused by the presence of an X-linked recessive allele (-), whose normal non-hemophiliac gene is (+).

  • Can two hemophiliac parents produce a normal son? A normal daughter?
  • Can two normal parents produce a hemophiliac son? A hemophiliac daughter?
  • Can a hemophiliac brother and sister have another sister who is normal?

Reference no: EM132436085

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