I have 2 genetics questions: 1) One of the genes for baldness is located on the
ID: 102564 • Letter: I
Question
I have 2 genetics questions:
1) One of the genes for baldness is located on the X chromosome and is recessive to the allele for normal hair at the same gene. If a bald male were to marry a carrier female, what would be the probability that the first born son would be bald? What percentage of the females produced in this liaison would be carriers?
2) A) In humans, one of the genes determining color vision is located on the X chromosome. The dominant form (C) produces normal color vision; red-green color blindness (c) is recessive. If a man with normal color vision has children a color-blind woman, what is the probability of their having a color-blind son? What is the probability of their having a color-blind daughter?
B) In the couple described in A) above, the woman gives birth to a color-blind daughter. The man sues for divorce claiming the woman was unfaithful to him and committed adultery. Based on your answers above will his case stand up in court? Explain your answer.
Explanation / Answer
Male baldness is a recessive X-linked inherited disease and found on the X chromosome. Male baldness is a recessive sex-linked trait (b) and found on the X chromosome only.
Genotype for,
Normal Female (carrier) -XBXb
Bald Male- XbY
XB Xb
Xb XBXb Xb Xb
Y XB Y Xb Y
The probability that the first born son would be bald is 50%
The females produced in this liaison would be carriers is 50%.The daughter receives Xb from the father and has a 50% chance to receive Xb from the mother.
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