The bottleneck effect reduces a population to a few individuals. What is the likely effect on the population?
Answer and explanation
Correct answer: C. Genetic diversity falls, and some alleles are lost or become much more common by chance
- Step 1: Only a few individuals survive. Step 2. They carry only part of the original alleles, so diversity falls. Answer: diversity falls. Why not the others: these claim diversity is kept or raised.
Practise more Genetics, Evolution and Biotechnology.
Free questions with an explanation for every one, and full timed Cambridge A-Level mock tests.
More Genetics, Evolution and Biotechnology questions
- What term describes the different forms of a gene found at the same locus on a chromosome?
- Two heterozygous parents (Bb) have children. B is dominant over b. What is the probability that a child shows the recessive phenotype?
- In a test cross, an organism showing the dominant phenotype is crossed with a homozygous recessive. What does a 1:1 ratio of offspring show?
- A cross of two dihybrid heterozygotes (AaBb x AaBb) with independent assortment gives which phenotype ratio?
- Cystic fibrosis is caused by a recessive allele. Two unaffected parents have an affected child. What are the genotypes of the parents?
- What is meant by codominance?