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Refer to the following information to answer the questions below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. They have a daughter who is a dwarf with normal color vision. What is the probability that she is heterozygous for both genes

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Answer:

  • Considering the whole progeny ⇒ the probability of having a girl heterozygous for both genes is 4/16 = 1/4
  • Considering only girls ⇒ the probability of having a girl heterozygous for both genes is 4/8 = 1/2
  • Considering only dwarf girls with normal color vision ⇒ the probability of having a girl heterozygous for both genes is 4/4 = 1

Explanation:

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