A 2-year-old boy is recently diagnosed with red-green color blindness which is an X-linked recessive disorder....
A 2-year-old boy is recently diagnosed with red-green color blindness which is an X-linked recessive disorder. Which of the following represents correct genotypes of this individual’s parents with respect to red-green color blindness? (X - wild type; X allele; R wild type autosomal allele; r recessive autosomal allele and Y chromosome)
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Mom Rr and Dad rr |
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Mom rr and Dad RR |
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Mom XX and Dad X'Y |
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Mom X'X and Dad XY |
Homework Answers
Answer:
d). Mom X'X and Dad XY
The colour blindness is an X-linked recessive disease. Males receive their X-chromosome only from the mother, so the carrier mothers can have affected sons.
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A 2-year-old boy is recently diagnosed with red-green color
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Red-green color blindness is due to an X-linked recessive allele in humans. A widow's peak (a hairline that comes to a peak in the middle of the forehead) is due to an autosomal dominant allele. Consider the following family history: A man with a widow's peak and normal color vision marries a color-blind woman with a straight hairline. The man's father had a straight hairline, as did both of the woman's parents. Use the family history to make predictions about...
Red-green color blindness is a human X-linked recessive disorder. The normal allele, XB, is dominant to the mutant allele, Xb. ill has normal color vision, but her father is color blind. Jill marries Tom, who also has normal color vision. Jill and Tom have a daughter who has Turner syndrome and is color blind How and from whom did the daughter inherit color blindness? O O O O O an ovum carrying X3 followed by fertilization by sperm from a...
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