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بارہویں جماعت · حیاتیات · 5 سوالات

نام: ____________________   تاریخ: ____________

1. A cross between a heterozygous and a homozygous recessive individual (Aa x aa) gives the phenotypic ratio:

   • A 1 : 1
   • B 3 : 1
   • C 9 : 3 : 3 : 1
   • D All the same

2. A dihybrid cross of two heterozygotes gives a phenotypic ratio of:

   • A 3 : 1
   • B 9 : 3 : 3 : 1
   • C 1 : 2 : 1
   • D 1 : 1

3. Haemophilia is carried on the:

   • A Mitochondria only
   • B X chromosome
   • C Chromosome 21
   • D Y chromosome

4. The sex of a human child is determined by the:

   • A Environment
   • B Egg
   • C Mother's age
   • D Sperm

5. Down syndrome is caused by an extra copy of chromosome:

   • A 18
   • B X
   • C 13
   • D 21