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Question
Write notes on - sex determination in the unborn baby. [2 marks]
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Solution
- The sex of the unborn child is determined by the father. (0.5 marks)
- The ovum carries 22 + X sets of chromosomes while sperms carry 22 + X or 22 + Y sets of chromosomes. (0.5 marks)
- When the ovum carrying X chromosome gets fertilised by the sperm carrying X chromosome, the resulting zygote will have 44 + XX chromosomes and a girl will be born. (0.5 marks)
- When the ovum carrying X chromosome gets fertilised by the sperm carrying Y chromosome, the resulting zygote will have 44 + XY chromosomes and a boy will be born. (0.5 marks)
- The sex of the unborn child is determined by the father. (0.5 marks)
- The ovum carries 22 + X sets of chromosomes while sperms carry 22 + X or 22 + Y sets of chromosomes. (0.5 marks)
- When the ovum carrying X chromosome gets fertilised by the sperm carrying X chromosome, the resulting zygote will have 44 + XX chromosomes and a girl will be born. (0.5 marks)
- When the ovum carrying X chromosome gets fertilised by the sperm carrying Y chromosome, the resulting zygote will have 44 + XY chromosomes and a boy will be born. (0.5 marks)
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