In a typical pea experiment, two true-breeding plants with distinct traits of a single character are called the and the offspring are called the which will always be

Parental generation

F1 offsprings

Hybrid/heterozygous

Explanation:

A true breeding plant will always produce the same trait of a given gene when self-crossed. A truebreeding plant is also referred to as Homozygous because it contains identical alleles of a gene. Hence, they undergo meiosis or gamete formation to produce gametes containing the same allelic content.

When two truebreeding plants with two different traits for the same gene i.e. homozygous for different alleles of a gene, are crossed. They are referred to as the Parent or P generation. Their first offsprings called F1 (first filial) offsprings will possess a mixture or combination of the two parental alleles, hence, the F1 offsprings are called hybrids or are said to be heterozygous.