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F1 Generation: Definition & Offspring

F1 Generation: Definition & Offspring
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  • 0:01 What Is the F1 Generation?
  • 1:28 Why Is the F1…
  • 1:51 Lesson Summary
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Lesson Transcript
Instructor: Jeremy Battista
In this lesson, we will be discussing what the F1 generation is with regards to Mendelian genetics. We'll look at who discovered this F1 generation and how it is used to help us better understand inheritance as far as genes and traits are concerned.

What is the F1 Generation?

Gregor Mendel was a pioneer in the world of genetics. Known as the 'Father of Modern Genetics', he is responsible for much of what we understand about how genetics work and how traits are passed on. His experiments of cross-breeding pea plants allowed us a glimpse into how our very own traits can be passed on or left behind. In Mendel's experiments, he would typically cross-pollinate different pea plants in hopes of getting specific and certain traits to show. When looking at his experiments, we notice the term 'F1 generation' comes up often. But what does it mean?

Gregor Mendel
Gregor Mendel

In basic terminology, the F1 generation is the first generation of offspring produced by a set of parents. The 'F' in F1 stands for 'filial.' So in short, F1 means 'first filial generation'.

F1 Generation Example
F1 Generation Example

If you are crossing two parents that are 'true breeding' - meaning they each have homozygous traits (one has dominant traits, the other has recessive traits) - the F1 generation will typically be heterozygous (having a genotype that is heterozygous and a phenotype that is dominant). Basically, if you have a parent with completely dominant genes and traits and cross them with another parent that displays recessive traits and has recessive genes, the F1 generation will display the dominant trait only. This occurs for purebred species only, and most organisms have multiple genes that will cross in other manners, resulting in slightly different F1 generations.

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