Podcast
Questions and Answers
Which of the following represents the correct number of chromosomes in humans?
Which of the following represents the correct number of chromosomes in humans?
What happens when a gene is 'expressed'?
What happens when a gene is 'expressed'?
Which of the following traits is controlled by a single gene?
Which of the following traits is controlled by a single gene?
How many protein-encoding genes do scientists now think humans have?
How many protein-encoding genes do scientists now think humans have?
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Approximately, what percentage of the human genome is actual protein-encoding genes?
Approximately, what percentage of the human genome is actual protein-encoding genes?
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Which of the following is not true of mitochondrial DNA?
Which of the following is not true of mitochondrial DNA?
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Study Notes
Chromosomes and Genes
- Humans have 46 chromosomes in every cell of their body.
- When a gene is 'expressed', it means the information it contains is used to synthesize a protein or functional RNA molecule.
Genetics and Traits
- Some traits are controlled by a single gene, such as blue eyes or freckles.
Human Genome
- Scientists estimate that humans have around 20,000-25,000 protein-encoding genes.
- Only about 1.5% of the human genome is composed of actual protein-encoding genes.
Mitochondrial DNA
- Mitochondrial DNA is not found in the nucleus of the cell.
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Description
Test your knowledge of human genetics with this quiz. Answer questions about chromosomes, gene expression, and genetic traits.
