Most studies on human genetics have been made through

  • A

    Genetic engineering

  • B

    Eugenics

  • C

    Microscopic study of chromosomes

  • D

    Pedigree charts

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Haemophilia is

Haemolytic jaundice is caused due to a dominant gene but only $10\%$ of the people actually develop the disease. A heterozygous man marries a homozygous normal woman; what proportion of the children would be expected to develop the haemolytic disease

  • [AIIMS 1982]

Recessive characters are expressed

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Fill the correct option for $A$ and $B$