Use the bonus words to complete the sentences.
1. In poultry breeding, a knowledge of genes helps a farmer predict the characteristics that the birds' genetics will have.
2. The offspring, which are carried within each chromosome, determine if a trait will be inherited.
3. A mutation is a sudden unexpected variation in a cell.
4. A recessive characteristic appears if only one parent has it, but a dominant one appears only if both parents have it.
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