What is the probability that a child will be male?
Answer and explanation
Correct answer: D. 50 percent
- Step 1: Eggs always carry an X chromosome. Step 2. Half of the sperm carry X and half carry Y. Answer: 50 percent. Why not the others: The other values do not follow from the sperm ratio.
Practise more Inheritance, Variation and Evolution.
Free questions with an explanation for every one, and full timed UK GCSE mock tests.
More Inheritance, Variation and Evolution questions
- What name is given to different forms of the same gene?
- A person has the genotype Bb. What does this tell you?
- Two heterozygous parents (Bb) have children. What is the probability that a child will be homozygous recessive (bb)?
- Which sex chromosomes does a human female have?
- Which condition is caused by a dominant allele?
- Which is the best definition of a mutation?