Biology · StudentHub Lesson
DNA & Genetics
How DNA stores genetic information and is passed from parents to offspring.
25 minIntermediate
01
What you will learn
- Describe the structure of DNA
- Explain how DNA differs from RNA
- Define genes, alleles, and traits
- Explain basic inheritance patterns
- Describe the role of DNA in protein synthesis
02
Watch the lesson
DNA vs RNA (Updated) · Amoeba Sisters
Watch on YouTube03
Topic notes
Main Idea
DNA is the molecule that stores genetic instructions, while RNA helps carry out those instructions to build proteins.
Key Concepts
- DNA is a double helix made of nucleotides
- Genes are segments of DNA that code for traits
- RNA is usually single-stranded and helps make proteins
Definitions
- Gene: a segment of DNA coding for a trait
- Allele: a version of a gene
- Nucleotide: building block of DNA/RNA (sugar, phosphate, base)
Processes
- DNA is transcribed into mRNA in the nucleus
- mRNA travels to ribosomes
- Ribosomes translate mRNA into proteins
Examples
A gene for eye color has different alleles (brown, blue) that determine the trait expressed.
Common Mistakes
- Thinking DNA and RNA are identical
- Confusing genes with chromosomes
- Believing traits come from a single gene only
04
Key concepts
DNA stores genetic information as a double helixGenes are DNA segments coding for traitsRNA carries instructions from DNA to ribosomesAlleles are different versions of a geneDNA is copied and passed to offspring
05
Important terms
- Gene
- A segment of DNA that codes for a specific trait.
- Allele
- An alternative form of a gene.
- Chromosome
- A structure made of tightly coiled DNA.
06
Quick revision
- DNA is a double helix
- RNA is usually single-stranded
- Genes code for traits
- Alleles are gene variants
- DNA -> RNA -> Protein
- Chromosomes carry many genes
- Traits pass from parents to offspring
07
Check your understanding
Question 1 · Multiple choice
What shape does DNA have?
Question 2 · Multiple choice
What molecule carries instructions from DNA to ribosomes?
Question 3 · True or false
An allele is a different version of a gene.
Question 4 · Short answer
What is a gene?
Question 5 · Short answer
Name the process of building proteins from mRNA.
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