1. Inside the nucleus, we find long strands of ____ that carry our genetic information. 2. These long strands are packaged into structures called ____. 3. Sections of DNA that code for a characteristic (such as eye colour) are called ____. 4. Different versions of the same gene are known as ____. 5. A characteristic that is passed from parents to offspring is described as being ____. 6a. If an allele always shows its effect even if only one copy is present, it is called ____. 6b. We represent these with a ____ letter 7a. If an allele is only shown when two copies are present, it is called ____. 7b. We represent these with a ____ letter 8. When an organism has two identical alleles for a gene (e.g., BB or bb), it is ____. 9. When an organism has two different alleles for a gene (e.g., Bb), it is ____. Mia was writing a report about why everyone in her family had slightly different eye-colours. Her dad explained that inside each of their cells was a long molecule called ____, which carried all their ____ instructions. This DNA was organised into packages called ____, and on each of these were tiny sections known as ____. Each one controlled a different characteristic. Mia learned that eye-colour was controlled by different versions of the same gene, called ____. Some versions were strong and always showed their effect; these were known as ____ alleles. Others only showed their effect when two copies were present, and these were called ____ alleles. Mia checked her own genotype: she had one brown-eye allele and one blue-eye allele. That made her ____, because her two alleles were different. Her brother, however, had two blue-eye alleles, so he was ____. When Mia finally finished her report, she concluded that their traits were ____ from their parents — passed down through the alleles they received.

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