Here's how it works:
* Normal Bengal tigers: They have the dominant gene for orange fur, which is why they are usually orange and black striped.
* White tigers: They have two copies of the recessive gene for white fur.
* Yellow (orange) siblings: If both parents carry the recessive white gene, they can have offspring with one or two copies of the dominant orange gene, leading to orange (yellow) siblings.
In essence, it's like how you can have two brown-haired parents with a blonde child. The blonde child inherited two recessive genes for blonde hair, even though their parents both carry the dominant gene for brown hair.