Genetics and Evolution Explained

So, I was in bio class, and my teacher started talking about chromosomes. I’m like,

“Cool, long DNA spaghetti.” Humans have 46—23 from mom, 23 from dad.

Thanks, genetics, for giving me my dad’s questionable taste in music.

Then there’s DNA, the double helix instruction manual for life. Its building blocks

are nucleotides—sugar, phosphate, and a letter (A, T, C,

or G). These letters decide everything from your hair colour to whether you can

roll your tongue. Next up, genes. Think of a gene as a tiny chapter

in DNA. Some chapters have different versions called alleles. Your eye colour