If gametes do not provide half the chromosome number in every generation, what will be the biggest long-term problem?
Answer and explanation
Correct answer: Chromosome number will become unstable generation after generation
Fertilisation combines the chromosome sets carried by two gametes. Normally, meiosis makes each gamete haploid, so two haploid sets combine to restore the stable diploid number. If gametes carried the full diploid number, fusion would produce twice as many chromosomes, and repeated generations would cause progressive chromosome-number increase and genetic imbalance. Thus option A is correct. The other choices do not follow from chromosome-number change and are unrelated to the mechanism.
Frequently asked questions
What is the correct answer to this question?
Chromosome number will become unstable generation after generation
Why is this the correct answer?
Fertilisation combines the chromosome sets carried by two gametes. Normally, meiosis makes each gamete haploid, so two haploid sets combine to restore the stable diploid number. If gametes carried the full diploid number, fusion would produce twice as many chromosomes, and repeated generations would cause progressive chromosome-number increase and genetic imbalance. Thus option A is correct. The other choices do not follow from chromosome-number change and are unrelated to the mechanism.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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