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Genetics problems - linkage and crossing over

2. An individual with Turner's syndrome and afflicted with the X-linked recessive trait
nystagmus is produced by parents that are both phenotypically normal. The individual has a brother that is also afflicted with nystagmus and a brother that is phenotypically normal. Is it the paternal or maternal X that is missing in the Turner's syndrome female? How do you know?

9. P1 transduction was done to determine the order of the fadD, gap, and pabB genes relative to each other. The donor was fadD-gap+ pabB- and the recipient was fadD+ gap- pabB+. Gap+ transductants were selected. The coinheritance of the nonselected markers are shown in the table below.

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2. An individual with Turner's syndrome and afflicted with the X-linked recessive trait
nystagmus is produced by parents that are both phenotypically normal. The individual has a brother that is also afflicted with nystagmus and a brother that is phenotypically normal. Is it the paternal or maternal X that is missing in the Turner's syndrome female? How do you know? (4 points)

Answer - The boys got their X chromosome from their mother (they have to have gotten Y from father in order to be males). Nystagmus is an X-linked ...

Solution Summary

Genetics problems relating to linkage, map distance etc.

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