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STD 12 - 4. principal of inheritance and variation — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Marriages between close relatives and cousins is not advisable because
  • A
    More mutations can occur
  • ✓
    More recessive defects are likely to appear
  • C
    More chances are there for $Rh$ blood group anomalies
  • D
    More chances are there for multiple births
✓

Answer

Correct option: B.
More recessive defects are likely to appear
b
(b) Marriages between close relatives and cousins is not advisable because recessive lethals are carried in heterozygous conditions and express themselves only when mating takes place between two carrier individuals or close relatives.

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