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[Vittorio15]

Hey guys , this doesn't make sense to me for some reason , can someone please explain it to me ....

Monohybrid crosses involve one factor only. For example, a cross might involve a true breeding (homozygous) tall plant crossed with a true breeding (homozygous) short plant. This produces a first generation where all of the plants are tall. Mendel explained the first generation trait as the dominant factor.

 

[chistar]

From the top of my head...

In Mendel's experiments, he observed one trait at a time, in this case, height. He bred a tall plant (TT) with a short plant (tt) --> its offspring were tall, which meant that the tall gene was dominant and so expressed itself over the short gene

Punnet square looks something like this...
T T
t Tt Tt
t Tt Tt

The gene for shortness was masked, but did not dissapear. So, if these offspring were bred with each other, the short gene may show itself again (the genotype would have to be tt)

 

[Vittorio15]

ty