Here's how recessive traits were hidden in Mendel's experiments:
* Pea Plants: Mendel chose to study traits that were easily observable and had clear contrasting forms, like flower color (purple vs. white).
* Dominant and Recessive Traits: Some traits, like purple flower color, were *dominant*. This meant that if a plant inherited even one copy of the purple flower gene, it would have purple flowers. Other traits, like white flower color, were *recessive*. This meant that a plant needed to inherit two copies of the white flower gene to have white flowers.
* Heterozygotes: When a plant inherited one dominant gene (purple flower) and one recessive gene (white flower), it would still have purple flowers. This is because the dominant gene masked the recessive gene. These plants were called *heterozygotes*.
* Hidden Recessive: The recessive gene for white flowers was still present in the heterozygote, but it wasn't expressed (visible) in the plant's appearance. This is why it was said to be "hidden".
Mendel's experiments revealed the patterns of inheritance:
* When he crossed two heterozygotes, he observed that some offspring had purple flowers, while others had white flowers. This was because the recessive gene for white flowers was now expressed in the homozygous recessive offspring (receiving two copies of the white flower gene).
So, the recessive traits were hidden in the heterozygous generation, also known as the F1 generation, where they were masked by the dominant trait. They reappeared in the F2 generation when two heterozygotes were crossed.
