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Child death may occur in the marriage of:

Correct answer: B. Rh+ man and Rh- woman

  • A. Rh+ man and Rh+ woman
  • B. Rh+ man and Rh- woman
  • C. Rh- man and Rh- woman
  • D. Rh- man and Rh+ woman

Explanation

Rh factor plays a crucial role in a child's birth born out of a marriage between Rh- woman and a Rh+ man. In such a case, the mother becomes sensitive while carrying a first Rh+ child within her womb. The reason for such sensitivity is that some of the RBCs from the developing embryo get into the bloodstream of the mother during development, causing her to produce anti­Rh antibodies. In fact, the first child of such parents is nearly normal and is delivered safely. However, if such a mother gets pregnant again, the subsequent Rh fetuses will be exposed to the anti­ Rh antibodies produced by the mother. As a result serious damage to the red blood cells of the developing embryo will occur causing hemolytic disease of the newborn (HDN) or erythroblastosis Foetalis. This disease leads to the death of the developing embryo before birth or after parturition.

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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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