S.V.T. terminale D - Biologie Hérédité et Génétique

Caractères récessifs et dominants (html)

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Recessive and Dominant Inheritance



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Mechanisms of recessive and dominant inheritance.

  •  Recessive Inheritance

Both parents carry a normal gene (N), and a faulty, recessive, gene (n). The parents, although carriers, are unaffected by the faulty gene. Their offspring are affected, not affected, or carriers. This type of inheritance was first shown by Mendel.

  • Dominant Inheritance

One parent has a single, faulty dominant gene (D), which overpowers its normal counterpart (d), affecting that parent. When the affected parent mates with an unaffected and non-carrier mate (dd), the offspring are either affected or not affected, but they are not carriers.


Last modified: Thursday, 17 December 2015, 12:32 PM
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