Genetics and Heredity Quiz

10 multiple choice questions

1. What is a gene?

A) A chromosome B) A segment of DNA that codes for a trait C) A type of cell D) A mutation

2. How many chromosomes do humans have in each body cell?

A) 23 B) 46 C) 48 D) 44

3. What is the difference between genotype and phenotype?

A) Same thing B) Genotype is genetic makeup; phenotype is physical appearance C) Opposite of phenotype D) Only applies to animals

4. If an organism is homozygous dominant (BB), what is its phenotype?

A) Recessive trait expressed B) Dominant trait expressed C) Mixed traits D) No trait expressed

5. What is DNA short for?

A) Deoxyribose Nucleic Acid B) Dinitrogen Acid C) Dual Nuclear Acid D) Deoxyribose Nucleotide Acid

6. DNA is shaped like what?

A) A ladder B) A double helix (twisted ladder) C) A single strand D) A triangle

7. What is a Punnett square used for?

A) Measuring cells B) Predicting offspring genotypes C) Growing plants D) Measuring evolution

8. If both parents are heterozygous (Bb), what fraction of offspring will show recessive trait?

A) 0% B) 25% C) 50% D) 75%

9. What are sex chromosomes?

A) Chromosomes 1-22 B) X and Y chromosomes that determine sex C) All chromosomes D) Only found in plants

10. What is mutation?

A) Cell division B) A permanent change in DNA sequence C) A type of gene D) Replication of DNA

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