The colour blindness is more likely to occur in males than in females because:
Correct answer: B. Genes for characters are located on the sex chromosomes.
- A. The Y-chromosome of males have the genes for distinguishing colours.
- B. Genes for characters are located on the sex chromosomes.
- C. The trait is dominant in males and recessive in females.
- D. None of the above.
Explanation
Colour blindness is produced by a recessive gene which lies on X chromosome. A marriage between normal visioned man (XY) and color blind women (Xc Xc ), results in color blind sons (Xc Yc ) and carrier daughters (XXc ).
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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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