Which of the following is not a hereditary disease

  • [AIPMT 2005]
  • A

    Cretinism

  • B

    Cystic fibrosis

  • C

    Thalassaemia

  • D

    Haemophilia

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$A$ : The heterozygotic female for haemophilia may transmit the disease to sons.
$R$ : Such traits show criss-cross inheritance

When a cluster of genes shows linkage behaviour they

  • [AIPMT 2003]

Genes that are similar in phenotypic effect when present separately, but together interact to produce a different trait and ratio is $9 : 7$ in $F_2$ generation. What are such genes known as