A marriage between normal visioned man and colour blind woman will produce offspring:
Correct answer: D. Colour blind sons and carrier daughters
- A. Colour blind sons and 50% carrier daughters
- B. 50% colour blind sons and 50% carrier daughters
- C. Normal males and carrier daughters
- D. Colour blind sons and carrier daughters
Explanation
In X-linked recessive inheritance, males have one X chromosome and one Y chromosome. A color-blind woman (XcXc) passes her Xc chromosome to all her sons, making them color-blind. Daughters inherit one X chromosome from their father, who has normal vision (XX), and one Xc chromosome from their mother, making them carriers (XXc). Therefore, the correct answer is: 'Colour blind sons and carrier daughters.' The other options incorrectly state the inheritance pattern for either sons or daughters based on standard Mendelian genetics.
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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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In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in males. It proves:
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Mendel studied inheritance of seven pairs of traits in Pea which can have 21 possible combinations. If you are told that in one of these combinations, independent assortment is not observed in later studies, your reaction will be: