Genotype, environment and epigenetics Quiz
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5 questions, one answer each
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1. Which of these is an epigenetic modification?
- A. Replacement of cytosine by thymine
- B. Deletion of a gene
- C. Crossing over in meiosis
- D. Methylation of cytosine bases in a promoter
2. What is the effect of removing acetyl groups from histones?
- A. Gene expression is reduced because chromatin is more condensed
- B. Gene expression is increased because DNA is released
- C. The base sequence of the gene changes
- D. The gene is copied twice
3. Which statement about ABO blood groups is correct?
- A. They are controlled by many genes with small effects
- B. They show continuous variation
- C. They are controlled by one gene with three alleles
- D. They are determined by the environment
4. Which feature is typical of a polygenic characteristic?
- A. A single gene has two alleles
- B. Many genes each have a small additive effect
- C. Only four phenotypes are possible
- D. The environment has no effect
5. Two identical twins have different methylation patterns at age 60. What is the best explanation?
- A. Their base sequences have become different
- B. They have different numbers of chromosomes
- C. They have different genotypes since birth
- D. Their environments affected which genes were switched on or off