Explore
Learn: B1 You and Your Genes
OCR TWENTY FIRST CENTURY SCIENCE BIOLOGY B Specification
Ready to start this lesson?
Sign in to track your progress. 18 steps including 9 interactive questions.
Sign In to Start Learning
Students also studied
Browse allSteps in this lesson (18)
Welcome!Today we'll learn about genes, DNA, and how they make us who we are. Let's explore how genetic material works step by step.
What is the genome?The genome is the entire genetic material of an organism. It contains all the instructions needed for growth, development, and functioning. In humans, it is found in nearly every cell.
Where is the genome located in eukaryotic cells?
Start the lesson to answer this multiple choice question
What are chromosomes?Chromosomes are long molecules of DNA found in the nucleus of eukaryotic cells. They carry sections called genes which provide instructions for proteins.
Understanding DNADNA (deoxyribonucleic acid) is a polymer made of nucleotides. It forms a double helix structure. The order of its bases (A, T, C, G) makes up the genetic code, which determines traits.
DNA is made of {{blank0}} which form a {{blank1}} structure.
Start the lesson to answer this fill in the blank question
What are alleles?Alleles are different versions of the same gene. They can lead to variations in traits, like eye colour or blood type.
Match the items on the left with their correct pairs on the right
Start the lesson to answer this matching question
How does DNA affect traits?Traits are influenced by the genotype (the genetic code) and the phenotype (how traits are expressed). The environment can also affect phenotype.
Which factors influence phenotype? (Select all that apply)
Start the lesson to answer this multi-select question
Mutations and genetic variantsMutations are changes in DNA that create genetic variants. These can affect traits positively, negatively, or have no effect at all.
What is a mutation?
Start the lesson to answer this multiple choice question
Review Time!Great work! You've learned about the genome, chromosomes, alleles, DNA structure, and mutations. Let's test your understanding further.
Alleles are {{blank0}} forms of a {{blank1}}.
Start the lesson to answer this fill in the blank question
Which of the following are found in eukaryotic cells? (Select all that apply)
Start the lesson to answer this multi-select question
What does DNA code for?
Start the lesson to answer this multiple choice question
Match the items on the left with their correct pairs on the right
Start the lesson to answer this matching question
Well done!You’ve completed your lesson on genes and DNA. Keep exploring more biology topics, and remember how important genetics is to life!
Want to Learn More?
Get personalised lessons, quizzes, and instant feedback from your AI tutor.
Explore More Topics