If a color blind woman marries a normal visioned man, their sons will be:
Correct answer: A. All colour blind
- A. All colour blind
- B. All normal visioned
- C. Onehalf colour blind and onehalf normal
- D. Threefourths colour blind and onefourth normal
Explanation
Colour blindness is a recessive sexlinked trait. Colour blindness is a recessive sexlinked trait.All sons will be colour blind and all daughters will be carriers.ill be carriers. If a color blind woman (XXc) marries a normal-visioned man (XY), all of their sons will inherit one X chromosome from the mother (Xc) and one Y chromosome from the father (Y). Since the sons receive the Y chromosome from the father, they will not inherit the color blindness allele from the father. However, they will inherit the X chromosome with the color blindness allele from the mother. Therefore, all of their sons will be color blind.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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