Why do resistant strains, like MRSA, pose a significant challenge to treatment, and how do they spread?

How do bacteria evolve quickly, and how do mutations contribute to the development of antibiotic-resistant strains?

What breakthroughs in the mid-20th century, such as the discovery of DNA’s structure, contributed to the development of the gene theory?

How did the observation of chromosomes and Mendel’s ‘units’ in the early 20th century lead to the understanding that genes are located on chromosomes?

What was observed in the late 19th century about chromosomes during cell division, and how did this relate to Mendel’s discoveries?

Why was the significance of Mendel’s work not recognized until after his death?

How did Gregor Mendel’s experiments contribute to our understanding of genetics, and what were his key findings?

How might understanding of dominant and recessive alleles influence decisions on embryo screening?

What are the potential economic, social, and ethical considerations surrounding embryo screening for inherited disorders?

What is cystic fibrosis, and why is it caused by a recessive allele?