1. **Decoding DNA: The Enzyme Regulation Riddle** 2. **Cystic Fibrosis: Offspring Probability** 3. **Environmental Factors and DNA Damage** 4. **X Chromosome Inheritance Patterns** 5. **Genetic E

Here are the correct answers to your questions: 1. **Which feature of DNA regulates the types of enzymes produced in a cell?** - **A. The order of the nucleotides in a DNA molecule** The order of nucleotides (the sequence of bases) in a DNA molecule determines the genetic code, which in turn dictates the types of enzymes and other proteins produced in a cell. 2. **Cystic fibrosis is an autosomal recessive disorder in humans. What is the probability that an offspring will have cystic fibrosis if both parents are carriers of cystic fibrosis?** - **C. 25%** If both parents are carriers of the cystic fibrosis gene, there is a 25% chance (1 in 4) that their offspring will inherit two copies of the recessive allele and thus have cystic fibrosis. 3. **Environmental factors can cause DNA within a cell to suffer damage. Environmental factors that are harmful cause cell differentiation primarily by preventing DNA within a cell from —** - **C. expressing certain genes.** Harmful environmental factors can lead to DNA damage, which in turn can prevent the proper expression of certain genes necessary for normal cell differentiation and function. 4. **A human male will normally transmit the genes on his X chromosome to —** - **A. only his daughters.** A male has one X and one Y chromosome. He will transmit his X chromosome to all his daughters and his Y chromosome to all his sons. 5. **Which of the following can genetic engineering cause?** - **C. Cures for diseases in humans** Genetic engineering has the potential to lead to cures for diseases by directly altering the genetic material responsible for those conditions. If you need further explanation on any of the answers, feel free to ask!