Question

Marriages between close relatives and cousins is not advisable because

• A. More mutations can occur
• B. 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 1

The correct option is B More recessive defects are likely to appear

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.